I found a box of 500 purchased from Kmart for $9.95 in 1982. Haven’t had a failure yet.
I have a bunch of military 30-06 FMJ in bandoliers that my dad bought cheap back in the early 1960s. And it was surplus from the Korean War. I’ve fired of a few dozen of it and it never fails.
I have some 12.7x99 from 1944 last time I used any - a couple of years ago - no misfires though I’m told that the rounds will not have as much speed as current manufacture
1982 .22s,,,
Good.