Quoted:
Quoted:
Isn't there an issue with the pressure curve of factory .308 vs. 7.62x51 in the M1As? Op rod issues and all. .308 is a higher pressure and has a different "bang" build up than .mil 7.62x51.
I'm pretty sure that you have that the other way around.
The important difference is again pressure, however it is a mirror problem to the .223/5.56 issue. A 7.62x51mm NATOs maximum average pressure is
50,000psi, where as a .308 Winchester is
62,000psi! That is a very significant gap. This can cause more than simply putting undo stress on the rifle, it is potentially extremly hazardous, especially in older military surplus rifles rechambered to 7.62x51mm, which can have even weaker recievers meant for older, less pressure ammo like a 7x57 Mauser. DO NOT fire commercial .308 out of a 7.62x51mm rifle. Fortunately there are not many modern rifles chambered in 7.62x51mm but it never hurts to check with the manufacturer.
Are the .308 Winchester and 7.62x51 NATO one and the same?" The simple answer is no. There are differences in chamber specs and maximum pressures. The SAMMI/CIP maximum pressure for the .308 Win cartridge is
62,000 psi, while the 7.62x51 max is
50,000 psi. Also, the headspace is slightly different.
We will discuss headspace issues and M1As next week with 'coastie...
Just sayin'...