So I started shooting 260 Remington last year. I have a Tikka Tac A1 in 260 and am having a issue with loosening primer pockets after a load or two. I'm using CCI primers with 43gr of H4350 and the Hornady A-tip 153 or when i'm playing the 147 ELD-M. I first tried Hornady brass and after 32 or 3 firings the primers pockets were gone. Then I got some prime brass thinking maybe some higher end brass might help me out. I seem to be in the same boat. So I don't have any more pressure signs and from my experience I will get heavy bolt of flat primers before I lose a primer or get loose primer pockets. I have read on some other threads, where other people have had primer pocket issues with 260 rem, so I guess i'm also wondering if that is the common pressure sign of this round or do I just need to buy some Lapua, Alpha, or Peterson brass. From what I read they are some of the best but maybe someone will know which one has the best primer pocket life.