The Firing Line Forums - View Single Post - Are there battle rifles designed for .308 (not 7.62)?

Jimro · December 15, 2009, 05:34 PM

Big Stick,

Yes, there is no way to convert CUP to PSI accurately. What you have to do is measure both. What happened was that the Gubmint measured the 7.62x51 in CUP and somewhere along the line someone typed "PSI" behind that measurement. The 308 has a SAAMI spec in PSI, which caused the whole "pressure difference" argument.

Jimro

December 15, 2009, 05:34 PM	#3
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	Big Stick, Yes, there is no way to convert CUP to PSI accurately. What you have to do is measure both. What happened was that the Gubmint measured the 7.62x51 in CUP and somewhere along the line someone typed "PSI" behind that measurement. The 308 has a SAAMI spec in PSI, which caused the whole "pressure difference" argument. Jimro __________________ Machine guns are awesome until you have to carry one.