Hey guys, I have a question about pressure in the 300 RUM. I am loading 169.5 RBBT HP Wildcat bullet with a charge of 100.0 gr of Retumbo. I use Fed 215 Match primers. The cart overall length is 3.630" in my gun. I have a Rem 700 Police. With this load, I have noticed that the primers are just slightly starting to crater. I can start to see the firing pin mark starting to make a raised crater. The primers do not seem to be flattening out, just cratering slightly. I shoot 1/4" 4 shot groups at 100 yards with this load. Is this a sign of too much pressure? Or are the primers of softer materials and this is nothing to concern myself with? Thanks.