I have recently shot .45 acp ammo from the WWll era, regularly shoot my M1 Garand with Milsurp. ammo from the late 50's and early 60's and just last Saturday I shot 12 gauge paper Shotshells from either the late 50's or early 60's.
Never had a FTF.
As long as the ammo was stored properly (cool & dry) it should last a long long time.
Chief38
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