I'm still shooting 7.62x51 Lake City ammo with stamps in the late 60s...still good stuff.
I haven't seen sealing the primers mentioned but it's the main way moisture will get in and ruin the powder. It rarely happens, but that's the weak point.
Raid your wife or daughter's bathroom for nail polish and go seal 'em up. But tell them WHY you need their nail polish, lest suspicions will fester.
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