How to Store Ammo: A Practical Guide
Ammunition is durable, but it isn't indestructible. How you store it decides whether a box is still reliable in ten years or whether it picks up corrosion and moisture damage in two. The good news is that good storage is mostly simple habits, not expensive gear.
Keep it cool, dry, and stable
The two enemies of stored ammo are moisture and heat. Moisture causes corrosion on cases and can get into primers and powder. Heat speeds up chemical aging, and large temperature swings make humidity problems worse because they cause condensation.
- Choose an interior space with a steady temperature, like a closet or a room in the living area.
- Avoid attics, garages, sheds, and car trunks, where summer heat and winter cold swing widely.
- Avoid basements that run damp, or add a dehumidifier if that's your only option.
- Keep it off bare concrete floors, which can wick moisture.
Use a sealed container
A good container does two jobs: it keeps humidity out and it keeps your ammo organized.
- Metal ammo cans with a rubber gasket are the classic choice. Check that the seal is intact and the latch closes firmly.
- Airtight plastic cases with a gasket also work well.
- Toss a desiccant pack in each container and replace or recharge it periodically, especially if you open the container often.
- Keep ammo in its original box or packaging when you can. The box keeps rounds from rubbing against each other and holds the lot number and product information.
Keep it away from chemicals and oils
Solvents, gun oil, and cleaning chemicals can seep into a case and contaminate powder and primers, which can cause misfires. Store ammo away from cleaning supplies, and wipe oil off your hands before you handle it.
Label and organize
An organized stash is a safer and more useful one. Group ammo by caliber and load, and keep the oldest boxes at the front so you shoot them first. Write the purchase date on the box if it isn't already printed there, and note where each caliber lives so you don't have to hunt for it. If you track your inventory in an app or spreadsheet, record where each box is stored too.
Store it securely
Ammunition and firearms should be stored so that children and unauthorized people can't reach them. Many people keep ammo locked, and separate from firearms. Storage laws vary by state and country, so check the rules where you live.
Check on it now and then
Every few months, open your containers and look at what's inside. You're looking for:
- Green or white powdery corrosion on cases
- Dented cases or loose bullets
- Any sign of moisture, mold, or oil in the container
- A desiccant pack that has become saturated
If a round looks damaged or corroded, don't shoot it. Ask your local range, a licensed dealer, or local authorities how to dispose of it safely, and never put live ammunition in the trash or a fire.
Keep track of what you have
Good storage and good records go together. When you know what you have, where it is, and how old it is, it's easy to rotate stock and avoid ending up with forgotten boxes. Ammo Box lets you organize boxes by storage location, record lot numbers, and see your inventory at a glance, all stored on your own device.