Calamity
Well-Known Member
The 1892, 7x57 Mauser is, I believe, the parent pattern case for most of the rimless American cartridges, such as the .308, 30-06 and .270 Win. I'm talking about head dimensions. SAAMI lists max chamber pressure for the 7x57 at 50,000 CUP, and for the 7mm-08 at 60,000 CUP. The .280 Rem, 30-06, .270 Win all run about 60,000 CUP or higher. I understand that ammunition makers load the 7x57 at around 46,000 CUP because there are some old M95 small ring mausers still in use, that might not stand the higher pressures. Does anyone out there load the 7x57 to 60,000 psi in a modern rifle, and if so, what kind of ballistics do you get? The 7x57 has greater case capacity than the 7mm-08, so it should out perform the '08.