Watch out for shooting old military ammo because for some reason military ammo was loaded with corrosive primers or powder way longer than the commercial stuff that we all shoot. I think it had something to do with better temperature ignition, but I know I was surprised at how recently it had been loaded. I'd be real careful about the 7.62x39 military stuff. I know we dropped some ultra hot 7.62x39 stuff out of helicopters in Vietnam to blow up an AK-47 for someone finding it and trying to shoot it.
