7.62x51 in a .308 rifle

[jrothWA]

Have shot TW M80 in my Win M70, with no problems.
Basically, the bolt action will handle the pressure differance between the MILSPEC nad SAMI ammo. MILSPEC cahmbersare dimension to handle the thicker case.
MILSPEC needs to have a thicker case, due to the rapid ejection of military chambers will under the resulting pressure.
SAAMI ammo will likely tear through the extraction groove/rim or pull the case head off.

Refer to the 5.56 chamber differences between the SAAMI, WYLDE, & NATO dimension charts.`

[Bart B.]

Originally Posted by jrothWA

Basically, the bolt action will handle the pressure differance between the MILSPEC nad SAMI ammo. MILSPEC cahmber sare dimension to handle the thicker case.
MILSPEC needs to have a thicker case, due to the rapid ejection of military chambers will under the resulting pressure.
SAAMI ammo will likely tear through the extraction groove/rim or pull the case head off.

Commercial 308 Win match ammo by the thousands loaded to 52,000 cup SAAMI max pressures fired in M1 and M14 rifles as well as commercial semiautomatic rifles never caused any problems. Military 7.62 and 30-06 ammo was loaded to 50,000 cup average.

Military M1 and M14 bolts don't start opening until bullets are 6 to 7 feet out the barrel. Pressure in the case at that time is only a few psi. Springfield Armory Technical Note SA-TN11-1094 dated 16 Dec 1957.