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Message: <blockquote data-quote="Shadowrider" data-source="post: 3868473" data-attributes="member: 3099">Stored in ideal conditions it can go past 100 years. Hercules was storing some of the original lot of Bullseye in deionized water. As a QC check they'd pull a sample, dehydrate it and compare new production lots to it. Alliant is probably still doing this if any of the original lot is left. I have seen data sheets that said "indefinitely" on them for shelf life but I don't think any of them do these days.I've never seen powder go bad since I used to store it in the house and now it's in the garage shelter which is pretty temp stable. Hot temps will degrade it faster but I think it's the wide swings that really amp up the degradation. The military stored ammo in basically what were metal shipping containers in the sandbox. Storage life is measured in decades like others have said as long as conditions are reasonable.</blockquote>