I tend to shoot a lot of .308/7.62 rounds. And after a lot of trial and error I discovered I really like the Federal Gold Medal Match. I really love this stuff. I found that I prefer GM762M2 over GM308M2. But they almost act exactly the same. I have noticed two interesting things while reloading some GM762M2 that the head stamp seems to have FC and 11, or FC and 12. I believe this is for the year it was made. I've also noticed that the primer whole is incredibly tight, and requires a little chamfering to ensure primers will seat smoothly and easily. After a bit of research on this, it seems that the GM762M2 is military spec, and only shows up on the market when there is an overrun. Whereas GM308M2 is the normal civilian market stuff. This would perhaps indicate why the primer pocket requires a little work. Has anyone else noticed this? Or encountered this?