The Sporting Arms and Ammunition Manufacturers Intitute (SAAMI) considers .308 Win and 7.62x51mm ammo interchangeable, but check the specifications for your firearm for using this ammo when your rifle does not specifically call for .308 Win. The .308 Win replaced the .30-06 Springfield as the military cartridge of choice in the second half of the 20th century. The .30-06 has a higher twist rate of 1:10 and has longer range capabilities, but the .308 twist rate of 1:12 increases the effect of tumbling upon impact. The significance here is in stopping power. A tumbling bullet will wreak more havoc on the target than a faster, more stable round.