primers look like Winchester Large Rifle Primers, they a bit soft, using Federal Gold Match or CCI Benchrest probaly would leave less craters, also I would adjust firing pin back by 1/8 turn and get that firing pin hole bushed . From 6mmbr: "When running stout loads, you can get cratering caused by primer flow around the firing pin hole in the bolt face. The reason is a little complicated, but basically the larger the hole, the less hydraulic pressure is required to crater the primer. A limited amount of cratering is normally not a big issue, but you can reduce the problem significantly by having a smith fit a bushing in the firing pin hole. In addition to reduced cratering, bushing the firing pin often produces more consistent ignition. This is a highly recommended procedure that our editors have had done to their own rifles. Greg Tannel (Gre-Tan Rifles) is an expert at this procedure, and his turnaround time is fast–usually 1-3 days (shop time). Current price for a bushing job, which includes turning the firing pin to .062?, is $60 including return shipping. (Price subject to change.) If you have a factory rifle, a bushed firing pin is the way to go if you are shooting the high-pressure cartridges such as 6PPC, 6BR, 6-6.5×47 and 6.5×47. This is one of the most cost-effective and beneficial upgrades you can do to your factory rifle." http://bulletin.accurateshooter.com/...ll-greg-tannel