Primer pockets get loose. It's just what happens (especially if you load em hot). My rule if thumb is if they don't fall out when I tap em on my bench, they're good enough for me. Been doing it for years. Has not affected accuracy or velocity with me and I still have all my face parts. If it concerns you though I think it's hart that makes a tool that tightens them up. I shoot 308 as well and use lapua brass.