rudymontana
New member
I found a piece of brass with this stamp on the bottom. I thought it looks similar to my 6MM case. They are the same case. Remington changed the name to 6MM (1963) when they changed rifling to 1/9 from 1/12 twist to accommodate heavier bullets. The 244 cartridge was good only up to 90 grs. with 1/12 twist. I thought this was interesting information since I have been shooting 6MM for many years. Rudy