Had the primers on my 308 Winchester backing out a tiny little bit (less than 1/2 a mm or so) out there on Saturday. Never had that happen. Any ideas on why they would be doing that? Some of the preliminary stuff I read said possibly low pressure but I'm not sure.
The Load Specs:
PPV 308 Winchester brass, once fired from their 168gr match ammo.
Powder: Reloader 15 43.5 grains
Primer: WLR magnum
Bullet: Hornady 150gr spbt and Sierra 150gr spbt, both batches backed out a little.
Rifle: Ruger Scout Rifle
The Sierra manual listed the max load for RL-15 and these bullets at 44.8 grains. I figured 43.5 would be a reasonable place to start. I thought that considering the short barrel and cold temperatures a magnum primer might help get all the potential out of a lower velocity round. I didn't feel any higher recoil or sticky bolt lift. The cases themselves dont show any signs of high pressure. I dont really know what to think here. I've never had that happen on any of my other loads. As far as brass/headspacing issues, I shot all that PPV match ammo through my Scout rifle and it chambered fine, shot excellent so I cant imagine it being an issue. Any ideas guys? Could that brand of brass just have bad primer pockets? Any safety issues presented by primers doing this?