Ok, I have a .204 that I don't really shoot a lot. It's used mostly for groundhogs and fox. I have been collecting brass for it to start reloading whenever I get around to it. I recently found out that the Federal ammo I have been using has been discontinued so I ordered 2 more boxes until I can get the supplies together to start loading. The problem is the new stuff I ordered has a different head stamp and the primer pockets look funny. The one one the right is the new stuff. Can anyone tell me why there's a difference?