A box of rifle ammunition prints a lot in small type. Four things matter: the cartridge name, the bullet weight, the bullet code and the headstamp on the case. Read those and you can usually tell what the round is for. The cartridge name The name tells you whether the round fits your rifle. .308 Winchester is the commercial name and 7.62x51mm NATO the military one. .223 Remington and 5.56x45mm...