Why Most Shooters Store Ammo Wrong
Walk into most gun owners' homes and you'll find the same thing: a cardboard box with 200 loose rounds rattling around, maybe a few half-empty factory boxes stacked in a corner, and absolutely no system for knowing what's what.
That works — until it doesn't.
Cardboard absorbs moisture. Loose rounds shift and damage primers. Mixed loads create dangerous confusion under stress. And when you need to grab a specific load in low light — or hand a mag to someone who needs it right now — you're fumbling through boxes hoping you grabbed the right one.
The military solved this problem decades ago. Mil-spec ammo cans, stripper clips, and desiccant packs aren't collector gear. They're the system designed to keep ammunition reliable for years and retrievable in seconds. The only difference between what the military uses and what most civilian shooters do is organization — and organization is free.
This guide gives you the complete system. Not just which products to buy, but exactly how to set it up, how to scale it, and how to maintain it.
Core principle: Your ammunition storage system should let you identify the load type, retrieve the right rounds, and begin loading magazines — without checking a single headstamp, even under stress, even in low light.
Choosing the Right Ammo Can
Not all ammo cans are created equal. For serious long-term 5.56 storage you need a gasket-sealed, stackable can with a secure locking bail handle.
Steel Military Surplus Cans (USGI .50 Cal)
The original. USGI steel .50 cal ammo cans have been the military standard for decades. They're nearly indestructible, stack perfectly, and seal tight. The downsides: they're heavy (about 5 lbs empty), they can rust externally in humid environments if the finish is compromised, and they vary in condition when purchased surplus.
Capacity: ~1,200 rounds of 5.56 loose / ~1,400 rounds with SCUSA polymer stripper clips
MTM Case-Gard AC50C (Recommended)
The MTM AC50C is our top recommendation for most shooters. High-density polymer construction makes it significantly lighter than steel surplus cans, the O-ring gasket creates an airtight seal without tools, and the interlocking lid design stacks cleanly.
Capacity: ~1,200 rounds of 5.56 loose / ~1,400 rounds with SCUSA polymer stripper clips
Weight empty: 2.4 lbs vs ~5 lbs for steel surplus
Seal: O-ring gasket, tool-free, airtight
What About Plano, Pelican, or MTM RS50?
Plano cases are fine for transport but not for long-term storage — the latches don't create an airtight seal. Pelican cases are excellent but expensive and overkill for most applications. The MTM RS50 is purpose-built for rifle rounds and works well, but holds fewer rounds than the AC50C.
For most shooters building a serious storage system: USGI steel surplus or MTM AC50C, stacked and labeled.
Stripper Clips vs Loose Rounds — The Numbers
This is where the math gets interesting — and where most people leave significant capacity on the table.
Loose Rounds
Loose rounds don't pack efficiently. They're cylindrical, they stack with air gaps, and they shift during transport. A .50 cal ammo can holds roughly 1,200 rounds of 5.56 packed loosely.
USGI Steel Stripper Clips
Steel clips organize rounds in 10-round groups which improves packing density slightly but adds significant weight. A steel USGI stripper clip weighs approximately 0.56 oz. At 140 clips (1,400 rounds), that's approximately 4.9 lbs just in clips alone — before a single round.
SCUSA Polymer Stripper Clips
SCUSA polymer clips weigh only 0.08 oz each — 7× lighter than USGI steel. At 140 clips, that's approximately 0.7 lbs in clips. The same number of USGI steel clips weighs 4.9 lbs.
Real-world weight savings: approximately 4.2 lbs per 140-clip / 1,400-round can.
Beyond weight, the slim polymer profile of SCUSA clips allows approximately 1,400 rounds to fit in a single .50 cal ammo can — about 200 more rounds than loose packing. The SCUSA system gives you more rounds per can AND significantly less weight than steel clips — with the added benefit of color-coded load identification.
The SCUSA Color-Coded Ammo ID™ System
This is the piece that takes a good storage system and makes it a great one.
The SCUSA Color-Coded Ammo ID™ System (Patent Pending) assigns a specific color to each ammunition load type. You open a can and you know exactly what's inside before you touch a single round.
The Three Colors
Olive Drab — M855 Green Tip (Steel Core Penetrator)
M855 is the standard military 62-grain steel-core penetrator round. Longer effective range, better barrier performance. Olive Drab clips are for M855 and green-tip loads only. The color is unmistakable even in low light.
Black — Duty, Defense & Premium Loads
Black clips are for your duty and defensive loads — M193, M855A1, premium defensive ammunition. These are your go-to mags. Black means business.
Range Orange — Training, Range & Bulk FMJ
Orange clips are for everything you shoot at the range that you wouldn't bet your life on in a defensive situation. Bulk M193, steel-cased practice ammo, frangible training rounds. Range Orange is visually distinct from both Olive and Black under any lighting conditions.
Why This Matters
Mixed ammunition in a magazine is a real problem — different bullet weights and profiles affect point of impact and can cause malfunctions with certain barrel twist rates. More importantly, grabbing the wrong can in a high-stress situation is a decision you don't want to be making under pressure.
Color-coded clips eliminate that decision entirely. The color tells you everything before your brain has to engage.
Note: The SCUSA Color-Coded Ammunition Identification System™ and associated color meanings are trademarks and protected trade dress of SCUSA Industries LLC. All rights reserved.
Desiccant — The Most Overlooked Piece
Most shooters think about ammo cans and stripper clips. Almost none think about moisture control — until they open a can five years later and find corrosion on their brass.
Modern brass-cased ammunition is far more moisture-resistant than older steel-cased loads. But the threat isn't just the cases — it's the primers and powder charge over years of sealed storage, particularly in environments with temperature cycling that causes condensation inside sealed containers.
Desiccare® MIL-SPEC Unit Pak Desiccants
The Desiccare® Unit Pak is the only desiccant we recommend for ammunition storage. It meets MIL-D-3464 Type I & II, MIL-D-3436, MIL-I-8835, and J-STD-033D standards — the same specifications the military uses.
- Size: 14g silica gel per pack
- Coverage: One pack per ammo can
- Recharge: Oven reactivation at 245°F — rechargeable indefinitely
- Shelf life (sealed): 2 years
- Color indicator: Changes color when saturated to signal recharge time
One pack per ammo can is sufficient for normal storage conditions. In high-humidity environments (coastal areas, below-grade storage), use two packs per can.
How Often to Check
Inspect desiccant packs every 12–18 months. If the color indicator shows saturation, recharge in the oven at 245°F for 1–2 hours and reseal. There's no limit to how many times a quality desiccant can be recharged.
Temperature, Humidity, and Shelf Life
Temperature
Modern ammunition is stable across a wide temperature range. The practical concern isn't heat damage — it's thermal cycling. A can that goes from 40°F to 90°F repeatedly will experience condensation inside the sealed container. This is exactly what desiccant is designed to address.
Ideal storage temperature: 55–70°F, stable
Acceptable range: 32–100°F
Avoid: Direct sunlight, uninsulated metal buildings in summer, below-grade areas with standing water risk
Humidity
Ideal relative humidity: 40–60%
Maximum: 70% (above this, inspect more frequently and double up on desiccant)
Shelf Life
Military-spec 5.56 ammunition stored correctly has a documented shelf life of 10+ years with essentially zero degradation. The US military routinely fires surplus ammunition that is 20–30 years old without issue when stored in proper conditions.
The enemy of ammunition longevity isn't time — it's moisture, temperature extremes, and physical damage to primers and cases.
Building the Complete System Step by Step
Here's the exact process for setting up a complete 5,000-round storage system using SCUSA clips and MTM AC50C cans.
What You Need
- 4× MTM AC50C .50 cal ammo cans
- 500× SCUSA Polymer Stripper Clips (split by load type)
- 1× Maglula® StripLULA® Gen II
- 2× SCUSA SLB Gen2 Loading Blocks
- 4× Desiccare® MIL-SPEC Unit Pak Desiccants (minimum)
- Labels or a paint pen for can identification
Step 1 — Sort Your Ammunition by Load Type
Before you touch a single clip, sort all your ammunition into three piles: M855/Green Tip, Duty/Defense loads, and Range/Training ammo. This is the only time you'll ever need to read a headstamp on this ammo — after this, the color tells you everything.
Step 2 — Load Clips Using the SLB Gen2
Set up your SCUSA SLB Gen2 Loading Block. Drop 10 rounds into the block, verify cartridge alignment using the Cartridge Height Verification™ open-top design, slide a stripper clip into position, and strip all 10 rounds onto the clip in one motion. Repeat.
With two SLB blocks running simultaneously, an experienced shooter can load 100 clips (1,000 rounds) in approximately 15–20 minutes.
- Olive Drab clips → M855 / Green Tip
- Black clips → Duty & Defense loads
- Range Orange clips → Training & Range ammo
Step 3 — Pack the Ammo Cans
Stand loaded clips upright in the can in rows. SCUSA's slim polymer profile allows approximately 1,400 rounds (140 clips) per MTM AC50C can. Pack tightly — the clips won't damage each other.
Do not mix colors in the same can. One can, one load type, one color.
Step 4 — Add Desiccant
Place one Desiccare® Unit Pak desiccant on top of the loaded clips before sealing. Press the bail handle down firmly to engage the O-ring seal.
Step 5 — Label Each Can
On the outside of each can, mark the load type, round count, date packed, and color code. A simple system: green label = Olive Drab / M855, black label = Black / Duty, orange label = Range Orange / Training.
Step 6 — Stack and Store
MTM AC50C cans stack securely via their interlocking lid design. Store off the ground on a shelf if possible. Keep away from direct sunlight and sources of moisture.
Step 7 — Maintenance Schedule
- Every 12–18 months: Inspect desiccant color indicators
- Every 3–5 years: Open and visually inspect ammunition for corrosion or case damage
- As needed: Recharge desiccants in oven at 245°F
How to Label and Organize Multiple Cans
Once you have more than 4–6 cans, visual labeling becomes critical.
Primary label (front of can): Color-coded adhesive label matching the clip color, load type in large print, round count.
Secondary label (top of can): Date packed, desiccant check date, lot number if tracking production batches.
Storage location: Keep same load types together on the same shelf. Left to right: Olive Drab (M855) → Black (Duty) → Orange (Training). When you reach for a can in low light you know exactly where each type lives.
FAQ
How many rounds fit in a .50 cal ammo can?
With SCUSA polymer stripper clips, approximately 1,400 rounds of 5.56/.223 per can. Loose rounds pack to approximately 1,200. USGI steel clips allow similar round counts but add nearly 5 lbs in clip weight alone.
Does 5.56 ammo go bad in storage?
Properly stored 5.56 ammunition has a documented shelf life of 10+ years and can remain reliable for 20–30 years. The key factors are moisture control (use desiccant), stable temperature, and avoiding physical damage to primers and cases.
How long does a desiccant pack last?
Desiccare® Unit Pak desiccants have a 2-year shelf life when sealed. Once in use, they need recharging every 12–18 months. They can be recharged indefinitely by heating in an oven at 245°F.
Can I mix load types in the same ammo can?
Technically yes, but it defeats the purpose of a color-coded system. Keep one load type per can, use the matching color clip, and you'll never need to read a headstamp again.
What's the difference between M855 and M193?
M855 is a 62-grain steel-core penetrator — longer range, better barrier penetration. M193 is a 55-grain full metal jacket — standard velocity, flatter trajectory at shorter distances. Use Olive Drab clips for M855, Black for duty M193 loads, and Range Orange for training M193.
Do polymer stripper clips work with StripLULA®?
Yes — SCUSA polymer clips are fully compatible with Maglula® StripLULA® Gen I and Gen II. They are NOT compatible with metal stripper clip guides, which can damage the polymer body.
How do I know when to recharge desiccant?
Desiccare® Unit Pak desiccants include a color indicator that changes when the silica gel is saturated. Check every 12–18 months. If showing saturation, recharge at 245°F for 1–2 hours.
What temperature is safe for storing ammunition?
32°F to 100°F is the acceptable range. Ideal is 55–70°F stable. The bigger concern is temperature cycling which causes condensation — desiccant addresses this directly.
SCUSA® and Color-Coded Ammo ID™ are trademarks of SCUSA Industries LLC. StripLULA® is a registered trademark of Maglula Ltd. Desiccare® is a registered trademark of Desiccare Inc. Always follow all applicable laws regarding ammunition storage in your jurisdiction.
