The oldest batch of ammo I have is 1938 through 1943 Turkish milsurp 7.92x57 (8mill Mauser) which performs just fine, haven't had a misfire yet (after a few hundred rounds) and it's quite accurate, too. The oldest handgun ammo I shoot is Czech 1954 7.62x25 (CZ 52 handgun), nice, hot, accurate, fireball of a muzzleflash, no problems with this ammo either.