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Bart B. · September 15, 2013, 04:43 AM

.308 Win and 7.62x51 NATO are completely interchangeable and have virtually the same peak pressures.

Most folks confuse the different pressure measuring methods each is typically measured with. 50,000 cup NATO round is the same as 60,000 psi .308 round. Military documents often stated pressure in pounds per square inch when copper units of pressure was the system used. Each system gives a different number for the same round. Each system has small differences; a 2000 unit spread across each is normal. The NATO round was originally spec'd at 50,000 cup and the commercial .308 at 52,000 cup due to subtle differences between the systems. Muzzle velocity for a given bullet weight in each is virtually the same.

The USA armed forces bought dozens of thousands (millions?) of .308 Win ammo for use in 7.62 NATO marked rifles.

There's no mention of Winchester beefing up the NATO round to higher pressure nor velocity in the following:

http://riflemansjournal.blogspot.com...f-308.html?m=1

September 15, 2013, 04:43 AM	#8
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	.308 Win and 7.62x51 NATO are completely interchangeable and have virtually the same peak pressures. Most folks confuse the different pressure measuring methods each is typically measured with. 50,000 cup NATO round is the same as 60,000 psi .308 round. Military documents often stated pressure in pounds per square inch when copper units of pressure was the system used. Each system gives a different number for the same round. Each system has small differences; a 2000 unit spread across each is normal. The NATO round was originally spec'd at 50,000 cup and the commercial .308 at 52,000 cup due to subtle differences between the systems. Muzzle velocity for a given bullet weight in each is virtually the same. The USA armed forces bought dozens of thousands (millions?) of .308 Win ammo for use in 7.62 NATO marked rifles. There's no mention of Winchester beefing up the NATO round to higher pressure nor velocity in the following: http://riflemansjournal.blogspot.com...f-308.html?m=1 Last edited by Bart B.; September 15, 2013 at 05:41 AM.