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I have some reloads ...in some rifle calibers I rarely shoot anymore ...and some of them are coming up on 20yrs old ....but stored properly, they've never shown any performance deterioration / or shown any deterioration even cosmetically.
Excessive heat ...and especially condensation or moisture ...are the only real culprits ....
I have some factory ammo ....rifles / and field loads for shotguns ...that are 40 yrs old or maybe a little more....and no problems with any of them either.
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