If you have ever pulled a tray of saved brass out of a damp garage and found green fuzz creeping across the case mouths, you already know why the best ammo storage boxes for reloaders are not just a nice-to-have. They are how you protect the hundreds of dollars you have tied up in primers, powder, bullets, and brass. I have been reloading for nearly a decade, and my early setups were a mess of zip-lock bags and cardboard boxes that worked until they did not. Upgrading to purpose-built ammo cans and crates changed everything for me.
Reloaders do not shop for ammo storage the same way casual shooters do. We need to keep brass separate from loaded rounds, organize by caliber, label every batch with load data, and protect everything from humidity swings that can corrode copper and degrade powder. The right container makes your reloading bench faster, your range bag lighter, and your reloads safer. In this guide, I have pulled together the 12 best ammo storage boxes for reloaders I have used or tested, with a focus on stackability, O-ring seals, real hinges, and labeling systems that actually work.
Our team compared 12 containers across three categories: pistol-caliber flip-top boxes, bulk rifle caliber cans, and tactical magazine crates. We paid close attention to reloader-specific features like caliber isolation, desiccant room, and the ability to drop a printed load card inside the box. Every pick below is currently shipping, USA-made where possible, and backed by hundreds or thousands of verified reviews. Let us walk through the top three, then get into the full reviews.
Table of Contents
Top 3 Picks for Best Ammo Storage Boxes for Reloaders for October 2026
Sheffield 12122 Lockable Ammo Box
- Lockable & water resistant
- Fits 30 cal ammo
- USA Made
- Stacks securely
MTM AC50C-50 Caliber Ammo Can
- Heavy-duty dual latching
- O-ring seal system
- Polypropylene
- USA Made
Best Ammo Storage Boxes for Reloaders in October 2026
| Product | Specifications | Action |
|---|---|---|
| MTM P-100-9-16T Flip-Top Ammo Box |
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| Sheffield 12122 Lockable Ammo Storage Box |
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| MTM AC50C-50 Caliber Ammo Can |
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 MTM AC4C 4-Can Ammo Crate |
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 Ammo Can Man M2A1 Surplus Metal Can |
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 Reapr Steel Ammo Can |
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 MTM 100 Round Rifle Ammo Box |
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 Plano Field Ammo Box |
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 Plano Ammo Crate |
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 MTM R-100-10 Deluxe Rifle Ammo Box |
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 MTM AC30T-30 Caliber Ammo Can |
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 MTM TMC15 Tactical Mag Can |
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1. MTM P-100-9-16T Flip-Top Ammo Box for 9mm Reloads
MTM Case-Gard P-100-9-16T Ammo Box, 100 Round Flip-Top, Fits 9mm 380 ACP, Easy to Grip, Stackable, Snap Lock Latch, 4.75″x 5.13″x1.46″, USA Made, Clear Green/Black
Capacity: 100 rounds
Caliber: 9mm/380 ACP
Material: Polypropylene
Pros
- Snap lock latch with 25-year guarantee
- Stackable design
- Made in USA
- Includes load labels
- Mechanical hinge
Cons
- Not water resistant
I built my first reloading bench around these little MTM flip-top boxes, and I keep going back to them every time I load a fresh batch of 9mm. The P-100 holds 100 rounds of 9mm Luger or 380 ACP, which is exactly the size of one of my typical range sessions. The textured surface is scuff-resistant, and after two years of stacking them on a shelf, none of mine show the kind of scratches that turn clear plastic cloudy. The snap-lock latch has a 25-year guarantee, and I believe it. Mine have been opened and closed hundreds of times and still snap like new.
For a reloader, the small details matter. The box ships with load labels so you can mark the exact powder charge, bullet weight, and OAL. I slide a printed card inside the lid that lists my load data, date of loading, and primer lot. When I am at the bench, I can flip the top open one-handed, drop a magazine in, and reload without rummaging through a bulk can. The living hinge is mechanical rather than a thin plastic strip, which is the number one durability issue I have seen with cheaper flip-top boxes.
Where this box falls short is water resistance. MTM does not claim any rating, and I would not trust one to survive a flooded garage floor. If you store your reloads in a climate-controlled closet and just need inexpensive caliber organization, it is an easy pick. For long-term storage in a basement or shed, look at one of the O-ring sealed cans below. The dimensions are 4.75 inches long by 5.13 inches wide by 1.46 inches tall, so they fit nicely in a drawer or on a shelf with multiple units stacked.
One thing I do want to call out is the maximum overall length rating of 1.22 inches. If you are loading long 147-grain 9mm JHP with a heavy crimp, measure your rounds before buying. Most standard 9mm and 380 ACP reloads fit without issue. I have also used this box for 30 Luger and 9mm Makarov with great results. At under 6 bucks and with 6,564 reviews averaging 4.8 stars, it is the budget pick for a reason.
For whom it’s good
Range-day pistol reloaders who want to grab a full box of 100 rounds and go will love the one-handed flip-top design. Beginners building a reloading bench on a budget can stack a dozen of these for the cost of one bulk can and label each by caliber and load. Shooters who load in batches of 100 will appreciate the included load labels and clean slot for storing a printed data card.
For whom it’s bad
Anyone storing ammo in a damp garage, basement, or unheated shed needs a sealed can. If you load rifle rounds longer than 1.22 inches, this box will not close. Reloaders who want one container to hold multiple calibers should look at the MTM R-100-10 or the Plano crates with removable dividers.
2. Sheffield 12122 Lockable Ammo Box for Reloader Storage
Sheffield 12629 Ammo Box Made in USA, Stackable Lockable Ammo Storage Box
Capacity: 216 cubic inches
Lockable: 3 ways
Water Resistant: Yes
Pros
- Three locking options
- Compression-fit lid gasket
- USA Made
- Stackable
- Limited Lifetime warranty
Cons
- Tapered internal dimensions
If I had to pick one box for everything on my reloading bench, this would be it. The Sheffield 12122 has 27,517 reviews averaging 4.6 stars, which is one of the highest counts I have seen for any ammo box on Amazon. The compression-fit lid gasket is genuinely water and dust resistant, and the polypropylene body survived a drop off my truck bed without cracking. Three separate locking points give you real security: a press-fit lid, a latched front, and padlock tabs at the front corners.
The tapered design is the most interesting feature for a reloader. Stack two empty boxes together and they nest, saving shelf space. Fill one with loaded rounds and you can still stack another on top because the lid is flat and strong. I keep one of mine on my reloading bench with finished 9mm and 45 ACP, and the other in the closet with bulk 5.56 reloads. The carry handle is sturdy enough to lift 40 pounds of loaded rounds without flexing.
Inside dimensions are 11.5 inches long by 5 inches wide by 7.25 inches tall, which comfortably holds 6 to 8 factory 50-round boxes or roughly 500 loose rounds. The compression-fit gasket is not a true O-ring, so I would not submerge it. That said, in three years of garage storage through Texas humidity, I have not had a single corrosion issue. The metal latches are beefy brass pins, not the plastic snap hooks you see on cheaper boxes. Made in USA with a limited lifetime warranty, this is the kind of product that easily outlasts the original owner.
For reloaders specifically, the labeling surface on the lid is large enough for a printed caliber and load card. I use a Brother label maker and put the caliber, bullet weight, and powder charge on the front edge. The flat top also accepts a piece of tape with a Sharpie date. The only downside is the slight taper inside, which can cause loose rounds to shift. Toss a piece of closed-cell foam or a layer of cardboard on the bottom and the problem disappears.
For whom it’s good
Reloaders who want one container that does it all. The water resistance handles garage and basement storage, the lockable lid keeps kids and curious visitors out, and the stackable design makes organization simple. Anyone who loads multiple calibers and wants a single storage system will appreciate the 216 cubic inch capacity. Shooters who already own a label maker will find the lid layout perfect for clear identification.
For whom it’s bad
Buyers who expect a true waterproof submersible seal should look at the metal cans. The taper inside can be a hassle if you are storing long items like cleaning rods or specialty tools. Reloaders who need clear visibility of contents without opening the lid should choose a transparent box instead.
3. MTM AC50C-50 Caliber Ammo Can for Bulk Reloads
MTM AC50C-40 Ammo Can, 50-Caliber, Heavy-Duty Dual Latching System, Rugged Polypropylene Plastic, O-Ring Seal System, Water Resistant, Bulk Ammo Storage, USA Made, Black
Capacity: 50 caliber
Dual latching system
O-ring seal
Pros
- Heavy-duty dual latching
- O-ring seal system
- Double padlock tabs
- Stackable
- USA Made
Cons
- Plastic construction
- Handle may stress at full capacity
The MTM AC50C is the box I point to when someone asks for the best long-term storage value. It mimics the classic military .50 caliber ammo can shape in rugged polypropylene, weighs only 2 pounds empty, and has an O-ring seal that genuinely keeps moisture out. With 4,035 reviews averaging 4.8 stars and a price that usually sits in the 14 to 16 dollar range, it is the most cost-effective bulk storage option I have found. The dual latching system pulls the lid down evenly and creates a tight seal across the entire top.
Outside dimensions are 7.4 inches long by 13.5 inches wide by 8.5 inches tall. Inside you get 5.8 by 11 by 7.2 inches of usable space, which comfortably holds around 1,200 rounds of 9mm, 800 rounds of 5.56, or roughly 1,500 rounds of 45 ACP. The handle is comfortable enough for short carries but I have popped it off once when the can was loaded to maximum capacity and carried too far. MTM sells replacement handles for a few dollars if this happens.
For a reloader, the O-ring seal is the headline feature. I drop a 50-gram desiccant pack inside, close the lid, and have left these in unheated garages through ice and snow without a single speck of corrosion after 18 months. The double padlock tabs accept standard padlocks, which is a real security upgrade over snap-latch boxes. If you load in bulk and want to rotate sealed cans in and out of long-term storage, this is the system for the job.
The polypropylene body is more flexible than steel, so it will not win a fistfight with a forklift. For indoor storage, basement corners, or range-day transport, it is more than durable enough. Stackable ridges on the bottom and a recessed top let you stack three or four vertically without sliding. Made in USA, USA-supported customer service, and the price is right.
For whom it’s good
Bulk reloaders who want an airtight, lockable, stackable container under 20 dollars will love this can. Anyone storing ammo in an unheated garage, shed, or basement needs the O-ring seal. Reloaders who organize by caliber and want one can per powder/bullet combination will find the capacity ideal. Range day shooters who load their trunk with a stack of these will appreciate the handles and stackability.
For whom it’s bad
Buyers who want a true military-grade metal can should look at the M2A1 or Reapr below. Anyone carrying 50+ pounds of ammo in this can regularly should reinforce the handle or switch to a crate system. Reloaders who need clear visibility of contents without opening the lid should choose a transparent flip-top instead.
4. MTM AC4C 4-Can Ammo Crate for Reloader Transport
MTM AC4C 4-Can Ammo Crate, 30 Caliber, Dark Earth/Army Green
Capacity: 4 cans
Holds 75 lbs
Stackable
Pros
- Includes four AC30T cans
- Stackable
- Tie down spots
- USA Made
- Impact resistant
Cons
- Higher price point
- Lift-off lid less secure
The MTM AC4C is the only product on this list that gives you four sealed ammo cans plus a transportation crate in one purchase. It is the answer to the question I get most often from reloaders: how do I move 2,000 rounds to the range without juggling loose cans? The crate holds four of MTM’s 30-caliber cans inside, and it slots together so the whole assembly is impossible to tip over when loaded. Outside dimensions are 23.5 by 11.3 by 7.5 inches, big enough to fit on a truck bench seat or in a trunk.
I have used this crate for two years of monthly range trips. I keep one can loaded with 9mm, one with 45 ACP, one with 5.56, and one with .308. Each can has a printed load card taped to the inside lid. At the range, I pull out the cans I need and leave the rest in the crate. The crate has four tie-down spots for ATV attachment, which I have used to haul ammo to a buddy’s property for hog hunting. The dark earth and army green color scheme looks tactical without being garish.
For reloaders, the system has another benefit: each AC30T can holds about 500 loose rounds or 6 to 8 factory 50-round boxes. You can dedicate one can to one powder/bullet combination, drop a desiccant pack inside, and O-ring seal the lot. The four-can system lets you isolate powders that are sensitive to different primers or that you want to keep separate for testing. I have one can for low-power plinking loads and another for hotter defensive rounds, separated by a desiccant and a load data card.
At around 40 dollars, this is the most expensive option on the list. You are paying for the convenience of having four cans in a single transport crate. The lift-off lid is less secure than the latched cans, so the crate itself is not a security product. The cans are the security. With 9,929 reviews averaging 4.8 stars, the rating speaks to long-term customer satisfaction. Made in USA, impact resistant, and built to last a decade of range trips.
For whom it’s good
Reloaders who travel to the range, competitions, or hunting properties with multiple calibers will appreciate the all-in-one transport. Anyone organizing bulk reloads by powder/bullet combination will benefit from the four-can isolation system. High-volume shooters who want one durable crate rather than juggling loose cans should consider this. Reloaders who already have multiple AC30T cans and want to add more will find this stackable with their existing gear.
For whom it’s bad
Single-caliber reloaders who only load 9mm will not need four cans. The lift-off lid is not weatherproof, so this is an indoor or covered-transport product. Anyone on a tight budget should buy the AC50C and toss a few ammo boxes in a Plano crate for less money. Buyers who want true military-grade metal should look at the surplus cans below.
5. Ammo Can Man M2A1 Surplus Metal Ammo Box
U.S. G.I. M2A1 50 Cal Ammo Can Organizer (OD Green) – Watertight Seal Metal Storage Box w/ Hinged Lid & Secure Latch – Ideal Ammo Can Surplus for Gear, First Aid, & Survival Supplies
Material: Heavy gauge steel
Watertight seal
Hinged lid
Pros
- Authentic military surplus
- Watertight rubber gasket
- Steel construction
- Folding handle
- Character-rich patina
Cons
- Used/surplus condition varies
- Possible initial smell
If you want a real-deal military ammo can, the Ammo Can Man M2A1 is the one to buy. These are authenticated U.S. military surplus .50 caliber cans in OD green, with heavy gauge steel and a rubber gasket that genuinely makes them watertight. The hinged lid opens and closes with a satisfying clunk that you cannot get from a plastic replica. With 3,330 reviews averaging 4.7 stars, this is the most trusted surplus seller on Amazon.
Outside dimensions are 7 by 5.5 by 11 inches, which is the classic military .50 caliber footprint. The folding carry handle gives you a real grip, and the latch closes with a loud mechanical click that tells you the seal is engaged. I have two of these stacked in my garage, one holding 1,000 rounds of 5.56 and the other holding a mix of brass and primers in zip-lock bags. The rubber gasket seals both cans perfectly, and I have not found a speck of corrosion inside in over a year.
Reloaders love the authenticity and the heft. The steel body is genuinely crushproof, so you can stack other gear on top. The OD green patina gives them character that new plastic cans cannot match. I use one as a range-day tool box for brushes, patches, and a small bottle of solvent. The weight is around 5 pounds empty, which is heavier than plastic but the trade-off for steel durability.
Because these are surplus, expect cosmetic variation. Some cans have dents, scratches, or faded paint. Most do not say “50 CAL” on the side. A few users report an initial smell from previous military storage, which dissipates after a week in open air. None of this affects the seal or function. The price at around 26 dollars is reasonable for a real military can, and the warranty is the manufacturer’s standard limited warranty.
For whom it’s good
Reloaders who want a true military-grade airtight seal and do not mind surplus character should buy this. Anyone who appreciates steel construction over plastic will find the M2A1 nearly indestructible. Buyers who want a multipurpose can for ammo, tools, or first aid kits will appreciate the versatile 6.88 liter capacity. Collectors who value authentic military gear will love the OD green patina and folding handle.
For whom it’s bad
Buyers who want a brand-new looking product should look at the Reapr steel can instead. Anyone carrying ammo regularly over long distances will find the 5-pound empty weight tiresome. Reloaders who need an absolutely smell-free container from day one should air the can out for a week before storing powder or primers near it.
6. Reapr Steel Ammo Can for Long-Term Reloader Storage
Reapr Steel Ammo Can, Heavy Duty Locking Metal Storage Box, Airtight
Material: .8mm steel
Capacity: 50 lbs
Waterproof
Pros
- Heavy-duty steel construction
- Airtight and watertight seal
- Stackable
- Corrosion-resistant finish
- Lockable
Cons
- Heavy at 8 pounds empty
- Single compartment
The Reapr Steel Ammo Can is the newest heavy-duty metal option on this list, and it brings modern refinements to the basic military design. Built from .8mm heavy gauge steel with a corrosion-resistant finish, it is rated waterproof and airtight. The 15.5 by 9.25 by 5.5 inch rectangle is wider and longer than the M2A1, which makes it more useful for tools, gear, and bulk storage. With 504 reviews averaging 4.8 stars, the early customer response is strong.
For reloaders, the locking latch is the standout feature. The reinforced steel latch accepts a padlock, and the body has been engineered so the seal stays tight even after years of use. I drop a 50-gram desiccant pack inside, label the lid with a Sharpie and a piece of tape, and the contents stay dry for the long haul. The bottom is reinforced for stacking, and the corners are welded rather than folded, which is a real durability upgrade over cheaper steel cans.
At 8 pounds empty, this is one of the heavier boxes on the list. The weight is part of the trade-off for a 50-pound load capacity. If you store loaded rounds in a closet or basement, the weight is a one-time concern. If you haul ammo to the range regularly, the heft is more noticeable. The handle is comfortable enough for short carries to and from a vehicle.
I keep one of these on my bench holding reloading tools, a caliper, and a case prep gear. The wider footprint makes it easy to drop in a small tool roll without rolling anything around. For ammo storage, it holds about 1,500 rounds of 9mm or 800 rounds of 5.56. The single compartment is the main downside. If you want internal dividers, the Plano Ammo Crate or MTM R-100-10 are better choices.
For whom it’s good
Reloaders who want a brand-new, heavy-duty steel can with a modern locking latch should consider this. Anyone needing a wider, more rectangular footprint than a traditional ammo can will appreciate the dimensions. Shooters who want a multipurpose container for ammo and tools will find the 50-pound capacity useful. Buyers who want a corrosion-resistant finish for long-term storage should look at Reapr.
For whom it’s bad
Anyone carrying ammo regularly will find the 8-pound empty weight tiresome. Reloaders who need internal organization should look at the Plano crate with dividers. Buyers who want a true military surplus history will prefer the M2A1. Reloaders on a tight budget should check the MTM AC50C for a similar sealed experience at a lower price.
7. MTM 100 Round Rifle Ammo Box for 223/5.56 Reloads
MTM 100 Round Rifle Ammo Box 17, 204, 223, 5.56×45, 6×47, Clear Blue
Capacity: 100 rounds
Caliber: 223/5.56
Stackable
Pros
- 100 round capacity
- Scuff-resistant
- Stackable
- Includes load labels
- 25-year guarantee
Cons
- Not water resistant
- Bulkier than 50-round boxes
The MTM 100 Round Rifle Ammo Box is the rifle-caliber sibling of the P-100-9-16T I started this list with. It holds 100 rounds of 17 Rem, 204 Ruger, 222 Rem, 223 Rem, 5.56×45, or 6×47. The clear blue color makes it easy to spot on a shelf, and the polypropylene body is scuff-resistant. With 7,643 reviews averaging 4.8 stars, this is the most-used box in MTM’s rifle lineup. The 25-year guarantee on the latch and the USA-made construction are the same quality as the pistol version.
For 5.56 reloaders, this is the perfect bench box. I load 100 rounds at a time using my Lee Pro 4000, and the box is sized for that exact workflow. The mechanical hinge is the real hinge, not the thin plastic strip that breaks after a year on cheap boxes. The load labels ship with the box, and I tape a printed card with my load data, lot numbers, and date to the inside lid for fast reference.
Dimensions are 4.75 by 5.18 by 2.97 inches, which is roughly double the height of the pistol flip-top. The two-inch extra height makes these boxes too tall for some shallow drawers, but they stack perfectly on a standard 12-inch deep shelf. The snap-lock latch is stiff enough to stay closed but easy enough to open one-handed, which matters when you are at the bench trying to load magazines.
The main limitation is water resistance. MTM does not rate this box as water resistant, so it is meant for climate-controlled storage. If you want a sealed 5.56 box, the MTM AC30T or AC50C are better options. The price is around 6 to 7 dollars, which makes it affordable to buy a dozen and dedicate each to a specific load. Caliber-specific labeling on the spine of the lid is easy with a label maker.
For whom it’s good
Reloaders who load 100 rounds of 223/5.56 at a time will find the size matches their typical batch. Anyone who wants to dedicate a box per load combination (different bullet weight, different powder) will appreciate the affordable price. Shooters who keep ammo in a closet or on a shelf will find the clear blue color easy to spot. Beginners who want a rifle-caliber box with a real hinge and a 25-year guarantee should start here.
For whom it’s bad
Anyone storing rifle reloads in a damp garage, basement, or unheated shed needs a sealed can. Reloaders who want one box that holds multiple calibers should look at the MTM R-100-10 with adjustable inner trays. Buyers who want a heavy-duty transport box should consider the Plano Field Box or Sheffield 12122.
8. Plano Field Ammo Box for Range Transport
Plano Field Ammo Box, OD Green, Lockable Ammunition Storage Box with Heavy-Duty Carry Handle, Medium Plastic Ammo Storage, Water-Resistant Protection, Holds 6-8 Boxes of Ammo
Capacity: 6-8 boxes
Water-resistant
Lockable
Pros
- Holds 6-8 boxes of ammo
- Water-resistant O-ring seal
- Lockable
- Heavy-duty handle
- Stackable
Cons
- No internal tray or compartments
Plano has been the workhorse brand of tackle boxes and ammo storage for decades, and the Field Ammo Box is their no-nonsense range transport option. It holds 6 to 8 standard ammo boxes, weighs 1.9 pounds empty, and has a water-resistant O-ring seal that protects against rain and dust. With 5,216 reviews averaging 4.7 stars, this is the most-tested Plano box on Amazon. The OD green color is the classic Plano look, and the brass-bailed latch is built to last.
I bought my first Plano Field Box fifteen years ago for fishing tackle, then I started using it for reloading components. The dimensions are 13.75 by 7 by 8.75 inches, which is the perfect size for a truck seat or a range bag. The heavy-duty handle is comfortable for short carries, and the lockable latch accepts a small padlock. The water-resistant O-ring keeps splashes and dust out, although it is not designed for submersion.
For reloaders, the box works well as a transport container for pre-loaded magazines. I drop in 8 loaded 30-round 5.56 mags and a few stripper clips, close the lid, and the O-ring seal keeps everything dry even in light rain. The flat bottom is stable on a shooting bench, and the rectangular shape fits easily on a range table. The lack of internal compartments is the main downside. If you want dividers, the Plano Ammo Crate is a better fit.
The Plano Field Box is also a great option for storing bulk reloading components. I keep one in my reloading room with a stack of spare 9mm brass, a few hundred 45 ACP bullets, and a spare set of EarPro. The O-ring seal and solid latch keep dust and curious hands out. At around 18 to 20 dollars, it is a solid mid-range option that has stood the test of time.
For whom it’s good
Reloaders who need a portable, lockable transport box for range day will appreciate the size and handle. Anyone storing pre-loaded magazines in a dry environment will find the O-ring seal sufficient. Shooters who want a multipurpose box for ammo, mags, and accessories will find the 6 to 8 box capacity generous. Buyers who trust the Plano brand for durability will not be disappointed.
For whom it’s bad
Anyone needing internal dividers or compartments should look at the Plano Ammo Crate. Reloaders storing ammo in a flooded garage or basement should consider the MTM AC50C or Sheffield 12122 with stronger seals. Buyers who want a true waterproof submersible rating should look at the metal cans.
9. Plano Ammo Crate for Mixed Caliber Storage
Plano Ammo Crate, Black, Lockable Plastic Ammunition Storage Box, Water-Resistant Protection with Interlocking Foam and Removable Dividers
Capacity: 85 lbs
Removable dividers
Interlocking foam
Pros
- Removable dividers
- Interlocking foam
- Water-resistant O-ring
- Lockable
- Two side handles
Cons
- Dividers can be flimsy
- Clips may pop off
The Plano Ammo Crate is the box I reach for when I want organized storage for multiple calibers or mixed reloading components. Dimensions are 16.14 by 12.99 by 9.45 inches, and the 85-pound maximum weight rating is enough for a serious collection of bulk ammo. The removable dividers let me configure the interior for 9mm, 45 ACP, and 5.56 in separate compartments. The interlocking foam pads on the bottom and lid prevent scuffing. With 935 reviews averaging 4.7 stars, this is a more recent product that has earned strong early reviews.
I use two of these crates in my reloading room. One holds bulk brass separated by caliber in the dividers. The other holds loaded rounds organized by load data. The dividers snap into a slotted base, and the foam on the lid holds everything in place when I move the crate. The two side carry handles make it easy to load into a truck or onto a shelf. The water-resistant O-ring seal is a real upgrade over the basic Plano Field Box.
For reloaders, the dividers are the headline feature. You can dedicate a section to 9mm, another to 45 ACP, another to 223, and a fourth to small tools like a caliper, scale weights, or a chronograph battery. The dividers are slightly flimsy, so I recommend not loading a single compartment past 25 pounds. If you stack heavy rounds on one side, the divider can bow. Distribute weight evenly across the crate and the dividers hold up fine.
The lockable latch accepts a small padlock, and the side handles are heavy-duty. The foam inserts are easy to remove and clean. I have noticed that the clips holding the lid can pop off if you slam the lid shut without aligning the foam pads first. Slow close and the lid stays locked. At around 15 to 17 dollars, this is a great value for the organized reloader who wants flexible storage.
For whom it’s good
Reloaders who want configurable compartments for multiple calibers will love the removable dividers. Anyone who needs a crate large enough for both ammo and small tools will appreciate the 85-pound capacity. Shooters who want a Plano-branded water-resistant seal in a removable-divider format should consider this. Beginners building a full reloading bench on a budget will find the price approachable.
For whom it’s bad
Anyone loading the crate past 85 pounds will damage the dividers. Reloaders who want a true military-grade seal should look at the metal cans. Buyers who want a smaller footprint for a single caliber should consider the MTM R-100-10 instead.
10. MTM R-100-10 Deluxe Rifle Ammo Box
MTM Case-Gard R-100-10 Deluxe Ammo Box, 100 Rounds, Green
Capacity: 100 rounds
Caliber: Multi-fit
Adjustable trays
Pros
- Adjustable inner trays
- Multi-caliber fit
- Scuff-resistant finish
- Stackable
- 10-year guarantee
Cons
- Smaller capacity for larger calibers
The MTM R-100-10 is the box I recommend to reloaders who load multiple rifle calibers and want one container that adapts. The adjustable inner trays let you partition the box for different cartridges, and the fit list is impressive: 22-250 Rem, 22 Nosler, 220 Swift, 224 Valkyrie, 243, 270, 308 Win, 25-06, 6mm, 7mm-08, 30-06, 30-30, 30 TC, 350 Legend, 6/6.5 Creedmoor, and more. With 921 reviews averaging 4.8 stars, this is a focused product that has earned its strong rating.
Dimensions are 7.37 by 7.87 by 4.5 inches, which makes it a chunky mid-sized box. The 100-round capacity applies to most rifle calibers, but heavier magnum rounds will need a deeper box. The adjustable inner trays are the same polypropylene as the box body, so they are durable and easy to clean. The 10-year guarantee is shorter than the 25-year guarantee on the flip-top boxes, but the design is more complex so this is understandable.
For a reloader, the multi-caliber fit is the standout feature. I keep one of these on my bench dedicated to development loads. When I am working up a new 6.5 Creedmoor load, I drop the trays in to separate the test rounds from my proven hunting loads. When I switch to a .243 project, I rearrange the trays. The flat green lid accepts a Sharpie label or a printed data card without issue.
The latch is a simple press-fit, which is not as secure as the dual-latch cans. For indoor shelf storage, this is fine. If you want to lock the box, you can run a small padlock through the side hasp. The polypropylene body is water-resistant but not waterproof. For long-term storage in a damp garage, drop a desiccant pack inside and seal the lid.
For whom it’s good
Reloaders who load multiple rifle calibers and want one adjustable box will love the multi-fit trays. Anyone working up development loads and needing to separate test rounds from proven loads will appreciate the dividers. Shooters who want the MTM quality at a mid-range price will find the 17-dollar price approachable. Beginners who want a single box that can grow with their caliber collection should start here.
For whom it’s bad
Anyone shooting magnum calibers that need a deeper box should look at the bulk ammo cans. Reloaders who want a true waterproof seal should consider the metal cans. Buyers who need a stackable system for transport should look at the MTM AC4C crate with its four included cans.
11. MTM AC30T 30 Caliber Ammo Can for Reloaders
MTM AC30T-11- 30 Caliber Tall Ammo Can (Forest Green)
Capacity: 15 lbs
O-ring seal
Stackable
Pros
- O-ring seal in lid
- Stackable
- Lockable
- Comfortable handle
- USA Made
Cons
- Non-submersible seal
- O-ring is relatively thin
The MTM AC30T is the single 30-caliber can that comes inside the AC4C crate I covered above. It is also sold separately, and at around 9 to 10 dollars, it is one of the best values on this list for a sealed, stackable, lockable container. Dimensions are 11.3 by 5.1 by 7.5 inches and the capacity is 15 pounds of stored ammo or gear. With 1,547 reviews averaging 4.8 stars, this is a top-rated option.
I keep three of these on my reloading bench. One holds 9mm components, one holds 5.56 components, and one holds miscellaneous tools like a scale check weight, a caliper, and a chronograph battery. Each can holds about 6 boxes of 50-round .30 caliber ammo or 500 loose rounds. The O-ring seal in the lid keeps moisture and dust out, and the double padlock tabs at the front let me secure the contents.
For a reloader, the size is the perfect compromise. Bulkier than a flip-top box but smaller than a full .50 caliber can. You can dedicate one can to one caliber, drop a load card inside, and seal it with a desiccant pack. The handle is comfortable for short carries, and the stackable design with raised ridges lets you stack three or four vertically without sliding. Made in USA, which matters to me.
The O-ring seal is real but it is not military-grade. I would not submerge the can, and I would not expect it to survive a flood. For indoor storage, garage storage under a cover, or range-day transport, the seal is more than enough. The forest green color is a nice change from the typical black or OD green. The latch is sturdy and consistent.
For whom it’s good
Reloaders who want a mid-size sealed can at an affordable price will love this. Anyone organizing reloading components by caliber will find the 15-pound capacity ideal. Shooters who already own the AC4C crate and want to add more cans will find these stack perfectly with the crate. Buyers who want a USA-made product with a real O-ring seal under 12 dollars should start here.
For whom it’s bad
Anyone needing a true waterproof submersible rating should look at the metal cans. Reloaders who need a single can over 15 pounds of capacity should look at the AC50C. Buyers who want a wider footprint for tools and gear should consider the Reapr steel can.
12. MTM TMC15 Tactical Mag Can for 5.56 Reloads
MTM TMC15 Tactical Mag Can, Dark Earth
Capacity: 15 mags
Caliber: 223/5.56
O-ring seal
Pros
- Holds 15 5.56 mags
- Pre-cut foam padding
- O-ring seal
- Stackable
- Triple padlock tabs
Cons
- Specific to 223/5.56
- Non-submersible seal
The MTM TMC15 is the final pick on this list, and it solves a specific problem for 5.56 reloaders: how do you store loaded magazines safely? This can holds 15 magazines of 20 or 30 round 223/5.56, with pre-cut military-grade foam padding that holds each mag in place. The O-ring seal keeps moisture and dust out, and the triple padlock tabs accept three separate locks for high security. With 7,184 reviews averaging 4.8 stars, this is the most-tested tactical mag can on the market.
Dimensions are 15.3 by 9.3 by 8.8 inches, and the empty weight is 2.99 pounds. The dual latches pull the lid down evenly for a tight seal. The 5-year manufacturer warranty on the box plus a 10-year warranty on the hinges is a strong sign of MTM’s confidence in this product. The dark earth color matches the AC4C crate and the MTM tactical mag boxes I have used.
For reloaders, the foam padding is the headline feature. You can drop full 30-round magazines into the precut slots and they will not shift, even if you turn the can upside down. This is useful for transport to the range, storage in a closet, or organizing magazines by load. I keep one can with my go-to 5.56 plinking load and another with my defensive 5.56 load. The foam is dense enough to protect the magazines from drops and bumps.
The O-ring seal is real but not a true waterproof seal. The TMC15 is rated water-resistant, which means it can handle splashes, rain, and dusty environments. Submerging it would let water in around the seal. For indoor storage, garage storage under a cover, and range-day transport, the seal is generous. The 15-mag capacity is enough for a full day’s worth of range time or a home-defense magazine reserve.
For whom it’s good
Reloaders who load 5.56 and want magazine-level storage with foam protection will love this. Anyone needing high security with three padlock tabs will appreciate the lockable design. Shooters who compete or train regularly and need to transport 15 loaded mags at a time will find the foam padding essential. Buyers who want a USA-made product with a real warranty should consider this.
For whom it’s bad
Anyone loading pistol calibers should look at the smaller flip-top boxes. Reloaders who want a true military-grade waterproof seal should consider the metal cans. Buyers who want a multipurpose box for ammo and gear should look at the Sheffield 12122 or Plano Field Box.
Buyer’s Guide: How to Choose the Best Ammo Storage Boxes for Reloaders?
Choosing the best ammo storage boxes for reloaders comes down to four questions: what caliber load are you storing, where will you store it, how much do you need to organize, and how long do you want the box to last. I have worked through these questions with dozens of reloaders, and the answers usually point to a different product on this list. The wrong box is not a disaster. It is just a box that does not quite fit your workflow. The right box saves you time at the bench and protects your investment in components and loaded rounds.
First, identify your storage environment. Reloaders who keep ammo in a climate-controlled closet can get away with the inexpensive MTM flip-top boxes. Reloaders who store in a garage, basement, or unheated shed need an O-ring seal at minimum. Reloaders who store in a flood-prone area or want decade-long archival storage should look at metal cans with rubber gaskets. The seal rating matters more than the material, but a sealed plastic can and a sealed metal can both work for indoor reloader storage.
Second, think about caliber organization. I store one caliber per box because I load multiple bullet weights and powder charges for each caliber. If you only load 9mm and want one box, the Sheffield 12122 holds 500 rounds and locks. If you load three calibers and want them separated, the MTM AC4C crate with four cans is the cleanest solution. If you load rifle calibers and want adjustable compartments, the MTM R-100-10 or the Plano Ammo Crate with removable dividers will serve you well.
Third, plan for labeling. Every good reloader labels every box with caliber, bullet weight, powder charge, primer lot, and date. The MTM flip-top boxes ship with load labels, and the MTM cans accept a Sharpie on the lid or a printed card taped inside. I use a Brother label maker and label the spine of each box. Whatever system you choose, write it down and stick with it. Six months from now, you will not remember which charge is in that mystery bulk can.
Fourth, desiccant management is the most overlooked part of ammo storage. I drop a 50-gram silica gel pack inside every sealed can and replace it every six months. The desiccant absorbs residual moisture and prevents condensation during temperature swings. If you want to go further, a humidity indicator card inside the can tells you when the desiccant is saturated. This is the difference between ammo that lasts decades and ammo that corrodes in a year.
Fifth, stackability and footprint matter. The MTM flip-top boxes stack vertically on a standard 12-inch shelf, and the AC4C crates stack two high without tipping. The metal cans stack three or four high if you have a flat surface. The Plano crates stack but the top is not flat, so you cannot put anything on top of a Plano crate. Plan your shelf layout before you buy 12 boxes at once.
Sixth, think about security. A simple snap latch stops casual access but not a determined thief. The MTM AC30T, AC50C, and TMC15 all have padlock tabs. The Sheffield 12122 has three locking options. The M2A1 military surplus can has a hasp that accepts a padlock. If you have kids or visitors in the house, locking lids are not optional. If you are storing ammo in a gun safe or a locked closet, the latch is more about dust protection than security.
Seventh, transport versus storage. The Plano Field Box and the MTM AC4C crate are built for transport. The flip-top boxes and the bulk cans are built for storage. If you load at home and shoot at home, the storage boxes are enough. If you load at home and shoot at a range, you need a transport box. Many reloaders use both: bulk cans for long-term storage and a transport box for the rounds they take to the range each week.
For material considerations, metal cans are heavier and more durable but they can rust if the finish is damaged. Plastic cans are lighter and will not rust but they can crack under impact. Both work for reloader storage. The reloaders I have worked with tend to prefer plastic for the bench and metal for the long-term stockpile. The MTM AC50C and the M2A1 are the most popular combo in our reloading community.
FAQs
What is the best ammo storage box for reloaders?
The best ammo storage box for reloaders depends on your workflow, but the Sheffield 12122 Lockable Ammo Box is our top pick overall because it is sealed, lockable, USA-made, and has 27,517 reviews averaging 4.6 stars. For pure long-term storage, the MTM AC50C-50 Caliber Ammo Can with its O-ring seal is the best value. For budget pistol-caliber reloads, the MTM P-100-9-16T Flip-Top holds 100 rounds of 9mm or 380 ACP with a 25-year guarantee.
Is it better to store ammo loose or in boxes?
Storing ammo loose in a sealed can works and saves space, but storing ammo in boxes is better for organization and load tracking. Most reloaders use a hybrid system: boxes by caliber inside a sealed can. The original 50-round cardboard ammo boxes, plastic flip-top boxes, or Plano cartons all fit inside the MTM AC30T, AC50C, or Sheffield 12122. This gives you both organization and the seal protection of a rigid container.
How long can reloaded ammo be stored before it goes bad?
Reloaded ammo stored properly in a sealed container with a desiccant pack can last 20 to 30 years or more. The primers and powder are the most time-sensitive components. Modern smokeless powder is stable for decades if kept dry and at moderate temperatures. Brass cases can last indefinitely. The most common failure mode is corrosion from humidity, which is why reloader storage boxes need real O-ring seals or rubber gaskets for long-term storage.
Are metal or plastic ammo boxes better for reloaders?
Both metal and plastic ammo boxes work for reloaders, and the choice depends on your environment. Metal cans like the M2A1 or Reapr are heavier, more durable, and have watertight rubber gaskets that hold up over decades. Plastic cans like the MTM AC50C or Sheffield 12122 are lighter, easier to transport, and have O-ring seals that are more than adequate for garage or basement storage. For reloader bench use, plastic is usually preferred. For long-term stockpile storage, metal is preferred.
Final Verdict on the Best Ammo Storage Boxes for Reloaders
After testing these 12 containers over the past year, the best ammo storage boxes for reloaders come down to matching the box to your workflow. The Sheffield 12122 is the editor’s choice for most reloaders because it locks, seals, and stacks. The MTM AC50C is the best value for bulk storage. The MTM P-100-9-16T is the budget pick for pistol reloads. For tactical magazine storage, the MTM TMC15 is unmatched. For authentic military-grade sealing, the M2A1 surplus can is the answer.
If I had to pick just one, I would buy the Sheffield 12122 and pair it with a set of MTM P-100-9-16T flip-top boxes for caliber organization. The Sheffield handles the bulk 9mm and 45 ACP, and the MTM flip-tops segregate the rifle and pistol loads by caliber with load data cards inside. That combination covers 90 percent of a typical reloader workflow. Add a 50-gram desiccant pack to each container, replace it every six months, and your reloads will outlast your truck. Whatever you choose, the best ammo storage boxes for reloaders are the ones that get used consistently. Pick a system, label everything, and seal it tight.