Ive got plenty of old part boxes and stuff and sometimes use a few, never had a bad one, but they're kept dry and in good condition. I went crow shooting with my uncle in the seventies, and he provided the ammo, in the form of 3" eley magnums in bb shot? Don't know why, or if he got them cheap, but they killed crows alright anyway. Well I've still got some, not that old I know, but forty odd years, and they still work just fine.