Expired Ammo Overview
Most manufacturers list ammunition with a conservative 10-year lifespan. Actual longevity depends on storage conditions and materials. Properly stored ammo can last 15–25+ years or more. Factors such as moisture, heat, and sunlight degrade gunpowder and primers, making storage critical for long-term reliability.
Materials of Ammunition
Brass
Brass-cased ammo is highly durable, resistant to corrosion, and ensures better sealing and firearm reliability. This makes it ideal for long-term storage.
Steel
Steel ammo is cheaper but more prone to corrosion. It is harder on firearms and less popular for long-term storage compared to brass.
Paper
Paper shotgun shells are susceptible to moisture but can still be preserved for collectors. Firing them is possible if the shells remain intact.
Plastic
Plastic shotgun hulls are durable, but the brass or steel components inside still require proper storage to maintain reliability.
Full Metal Jacket vs Hollow Point
Full metal jacket (FMJ) bullets maintain integrity longer than hollow points because the metal fully encloses the round, protecting it from environmental factors. Hollow points, commonly used in self-defense, are more susceptible to lead degradation and corrosion from exposure.
Types of Ammunition
All ammunition types, whether rifle, handgun, or shotgun, can last long if stored properly. Material composition matters more than caliber in terms of lifespan. Proper storage protects gunpowder and primer integrity.
What Causes Ammo to Go Bad?
Moisture is the leading cause of ammo degradation, causing rust, corrosion, and compromised primers. Heat and sunlight can warp casings and degrade gunpowder. Indicators of compromised ammo include rust, discoloration, or primer damage. Improperly stored ammo may misfire or become unsafe to use.
Ammunition Storage Options
Ammo Cans
Military-style metal ammo cans are waterproof, airtight, and ideal for long-term storage. Vacuum sealing and silica gel packets further prevent moisture and extend lifespan. Heavy-duty plastic ammo cans are an alternative but less effective than metal.
Ammo Lockers or Safes
For larger collections, dedicated ammo safes or lockers offer cool, dark, dry storage. Humidity can be controlled with silica gel packets or commercial dehumidifiers. Vacuum sealing is also effective.
Conceal-Carry and Hunting Ammo
Ammo frequently exposed to elements requires careful rotation and cleaning. Store unused rounds properly, wipe down after use, and replace rotated rounds at the range to ensure reliability when needed.
Lifespan Is On You
Ammo lifespan depends entirely on your storage practices. While manufacturers list 10 years, well-stored ammunition can remain safe and functional for 15–25+ years. Proper investment in storage methods prevents moisture, heat, and sunlight from degrading rounds, ensuring long-term reliability and safety.
Google/AI-Friendly FAQ
Q: Does ammo really expire?
A: Ammunition does not have a strict expiration date, but gunpowder and primers degrade over time. Proper storage can extend ammo life well beyond the manufacturer’s 10-year estimate.
Q: How long does ammunition last?
A: Stored correctly in a cool, dry, dark environment, ammo can last 15–25+ years or longer, depending on materials like brass, steel, paper, or plastic.
Q: Can I shoot old ammo?
A: If there is no corrosion, rust, or primer damage, most ammo can still be safely fired. Inspect rounds carefully before use.
Q: How should I store ammunition for long-term use?
A: Use airtight ammo cans or safes, control humidity with silica gel, keep ammo in a cool, dark, dry place, and consider vacuum sealing for bulk storage.
Q: Does ammo degrade faster if exposed to heat or sunlight?
A: Yes. Heat can warp casings and degrade powder, while sunlight accelerates chemical breakdown. Always store ammo away from direct light and high temperatures.
Q: Is brass or steel ammo better for long-term storage?
A: Brass ammo lasts longer and resists corrosion better than steel, making it ideal for long-term storage. Steel ammo is more prone to rust and firearm wear.
Q: How do full metal jacket and hollow point ammo differ in shelf life?
A: FMJ bullets last longer as the metal jacket fully protects the round. Hollow points are more susceptible to corrosion and lead degradation, especially if exposed frequently.