For firearm owners, enthusiasts, and preppers alike, securing ammunition for the long haul isn’t just about stockpiling—it’s about preserving function, safety, and value over time. Whether you’re planning for emergencies, practice, hunting, or just being prepared, how you store your ammunition can determine whether it works flawlessly when you need it most—or fails entirely.
Proper long-term ammunition storage is crucial to maintain reliability, safety, and shelf life. Moisture, temperature fluctuations, improper containers, and UV exposure can degrade stockpiled ammo, reducing effectiveness and even causing hazardous malfunctions. That’s why understanding the best practices for storage, from environmental controls to container choices, matters greatly.
While plastic bins and cardboard boxes may seem sufficient, many responsible gun owners opt for more durable solutions such as Metal Ammo Boxes—and for good reason. These containers offer excellent protection from environmental harm and have become a gold standard for ammo preservation.
Key Points
- Moisture control is the most critical factor in ammunition preservation.
- Temperature stability enhances both performance and longevity of ammo.
- Container choice—especially airtight and durable options—can make or break your storage solution.
- Proper organization and inventory management prevent waste and ensure readiness.
- Security measures are essential for responsible ownership and legal compliance.
Why Long-Term Ammo Storage Matters
Modern ammunition can last decades if stored correctly. However, it’s not immortal. Variations in heat, humidity, and exposure to oxygen can cause corrosion, compromise powder integrity, and degrade primers. This can result in misfires, jams, or even catastrophic failures. Whether you’re storing .22 LR or 5.56 NATO, the risks apply across the board.
Storing ammunition properly also saves money long term. Buying in bulk is cost-efficient, but only if your investment remains viable. Furthermore, in times of shortage or crisis, you’ll want to rely on your stored ammo without second guessing its condition.
Environmental Factors to Control
1. Humidity
Moisture is perhaps the most damaging element to stored ammunition. Humid environments promote corrosion on brass casings and primers, which can cause misfires or difficulty chambering rounds. Ammo should ideally be stored in a space with relative humidity under 50%.
- Use desiccants: Silica gel packets or rechargeable dehumidifiers can help absorb moisture within storage containers.
- Vacuum-sealed bags: Great for long-term redundancy, especially for loose ammo.
2. Temperature
Extreme temperatures and fluctuations can negatively affect powder stability. Aim for a consistent environment, ideally between 55°F and 85°F. Avoid attics and basements unless they are climate-controlled.
3. Light Exposure
Ultraviolet (UV) light can degrade packaging and weaken certain materials. Keep ammo in opaque containers and out of direct sunlight.
Choosing the Right Storage Containers
Not all containers are created equal. In the world of ammunition storage, durability, airtight sealing, and stackability are key considerations.
Metal Ammo Boxes
These are a popular and dependable choice for long-term storage. Their tough construction can withstand physical impacts and environmental changes. Genuine military surplus cans are often the go-to, offering rubber gaskets that create a tight seal against moisture and air.
High-quality Metal Ammo Boxes combine rugged protection with stackability and portability. They can be stored in safes, closets, or cabinets without worry.
Plastic Ammo Cans
Lightweight and rust-proof, plastic containers are suitable for shorter-term use or indoor environments. Some models feature rubber gaskets and reinforced construction, but they usually lack the durability of metal options in harsher conditions.
Vacuum-Sealed Bags
For those who want to store ammunition in bulk or add an extra layer of protective redundancy, vacuum sealing removes air—and thereby moisture—from the equation entirely. These bags can be stored inside larger metal or plastic containers for best results.
Organizing and Labeling
Effective storage isn’t just about protection—it’s also about access and efficiency. Proper organization ensures you know what you have, where it is, and whether it’s still viable.
- Label everything: Include caliber, date of purchase, and quantity on each container.
- Rotate stock: Follow a first-in, first-out (FIFO) system to use older ammunition first.
- Inventory logs: Maintain spreadsheets or physical logs to track usage and quantities.
Security Measures
Storing large quantities of ammunition requires attention to security—not just from theft, but from unauthorized use. Children, guests, or intruders should not be able to access your ammo stash easily.
Storage Location
Choose a secure, out-of-sight location such as a gun safe, locked closet, or dedicated storage cabinet. Avoid areas prone to flooding or high temperature swings.
Fire Safety
Ammo doesn’t explode like Hollywood might suggest, but it’s still a fire hazard. Use fire-resistant containers or store ammo in a fire-rated safe if possible.
Storing Different Types of Ammo
Centerfire Cartridges
These are more moisture-resistant than rimfire ammo due to their sealed primers. Still, store them in dry, cool conditions for maximum longevity.
Rimfire Cartridges
More sensitive and prone to moisture damage. Store in airtight containers with desiccant packs and avoid high humidity areas.
Shotgun Shells
Plastic hulls can deform under pressure or heat. Store upright in original boxes inside hard containers to maintain their shape and function.
Loose Ammo
If you’ve removed rounds from original packaging, store them in labeled ammo boxes or vacuum-sealed bags with silica gel. Group by caliber and manufacturer for clarity.
Legal Considerations
Local and federal laws may dictate how much ammunition you can store and in what conditions. While federal law is relatively lenient, some states or municipalities have limits. Check your local regulations to stay compliant.
Additionally, ensure documentation and permits, if required, are kept up to date—especially if storing large quantities or operating a home-based business involving firearms or ammo.
Long-Term Storage Tips and Best Practices
- Inspect regularly: Periodically check stored ammo for signs of corrosion or damage.
- Avoid overhandling: Oils and moisture from hands can accelerate corrosion.
- Double protection: Use desiccants and airtight containers together for best results.
- Maintain low humidity: Use a dehumidifier within the storage room or safe.
- Store off the floor: Use pallets or shelves to keep containers away from flood-prone ground surfaces.
Common Mistakes to Avoid
- Storing in original cardboard boxes in humid areas: These absorb moisture and offer no protection.
- Using non-sealed plastic bins: These allow air and humidity to enter freely.
- Neglecting rotation: This can leave you with expired or degraded ammo at the bottom.
- Overloading containers: Can lead to crushed packaging and decreased accessibility.
Conclusion
Ammo is an investment—both in terms of money and preparedness. Proper long-term storage ensures that investment remains reliable and effective for years, or even decades. By controlling environmental conditions, using durable containers like Metal Ammo Boxes, and staying organized and secure, you can feel confident that your ammunition will be ready when needed most.
Frequently Asked Questions (FAQ)
How long can ammunition be stored safely?
Properly stored ammunition can last 20–50 years or longer. Military surplus examples show functionality even after decades when stored under optimal conditions.
Can I store ammunition in a garage or shed?
Only if it’s climate-controlled. Garages and sheds often experience temperature and humidity extremes that can degrade ammunition quickly. Use sealed containers with desiccants if no other space is available.
Is it safe to store ammo in the same safe as my firearms?
Yes, as long as the safe is dry and fire-resistant. However, keep in mind that in the event of a fire, having ammo and firearms stored together may increase cleanup and insurance complications.
How do I know if ammo has gone bad?
Look for signs such as tarnished or corroded casings, damaged primers, or unusual smells. If unsure, dispose of it at a certified hazardous materials facility or shooting range that accepts old ammo.
Should I remove ammo from its original packaging for long-term storage?
It depends. Original packaging is designed for short- to mid-term storage. For long-term storage, transferring ammo to airtight and labeled containers with desiccants is typically more reliable.
Can I store different calibers in the same container?
Yes, but keep them separated and clearly labeled to avoid mix-ups. Use dividers or smaller inner boxes to keep calibers organized within a larger container.
