Loading for my 6.5 PRC. 52.0 gr IRM 7828 and 55.5 gr H1000, bullet is Hornady 140 gr BTHP. Hornady reload info says I can go up to 55.1gr of 7828 and 59.0gr of H1000 so I shouldn’t be getting and pressure problems yet but not sure what is causing the ring around the firing pin mark on the primer. Action is a Remington 700, bolt is a PTG with standard firing pin diameter and sako extractor. What is causing this ring?