Does Ammo Expire? How Long Ammunition Really Lasts
March 18, 2026 · AmmoBin.com
Ammo doesn't have a printed expiration date, and properly stored modern ammunition can last for decades. What matters is storage, not age. Here's the reality.
What actually degrades ammo
The enemies are moisture and heat, not time. Humidity corrodes cases and can degrade primers/powder; heat cycling accelerates it. Quality factory ammo kept cool and dry stays reliable for decades — military surplus from many decades ago still fires.
Signs ammo may be compromised
- Heavy corrosion, green crud, or pitting on the case
- Bullets that wiggle loose in the case mouth
- Cracked cases or signs of water intrusion
- Stored in a hot, humid, or flooded environment
Store it right
Cool, dry, dark, sealed — see our full how to store ammo guide. Brass-cased ammo resists corrosion best (brass vs steel). This is why buying in bulk pays off long-term.
Frequently asked questions
Does ammunition expire?
There's no expiration date. Stored cool and dry, quality factory ammo stays reliable for decades. Moisture and heat — not age — are what degrade it.
Is it safe to shoot old ammo?
Usually, if it was stored well and shows no corrosion, loose bullets, or case damage. Inspect it first; when in doubt, don't chamber questionable rounds.
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