So this is a 2 part question. I've been reloading FC brass for my .300 WSM
because it seems like I can frequently find their cheap 180gn factory stuff. I thought this was a good option cause it seemed to shoot well for just plinking a bit and the cases looked beautiful after 1 trip through the gun. The problem I'm having is it seems like I'm only able to reload the brass 3 or so times before the primer pockets get so loose I feel nervous the primers are gonna fall out.... If that's the case then maybe I need to start collecting a different brass and if so what?? Or is there something I'm doing that's causing the loose pockets? I don't do anything crazy, I've got a Hornady single stage press that I use with RCBS dies. I full length resize everytime I de-cap. Standard corn media, and CCI 250's. Ideas??
Part 2, just general pet load question.... I've tried a bunch of loads but my Berger 168gn VLD, CCI 250, 66.1gn of h4831 sc seems to pretty consistently produce .65" groups at 100yds. I feel like I should be able to do better and it seems I often get flyers. I'll shoot 5 shot groups and ill get 1 almost everytime that's over an inch from the main group. Is it me? The gun? Is there anything anyone sees that I'm not? The guns a Rem 700 with a custom muzzle break, I adjusted the factory trigger creep out and lightened the pull and use a Vortex Viper scope.