I have been have pressure isssues with my 700 in 260 doesn't seem like it wants more than 41 grains of 4350 with 40 grain bullet. I original checked the headspace with the firing pin in and the bolt would not close what so ever with no go guage. Today I checked it with firing pin out and the guage seated in the extractor and it closed easily so my question is firing pin in or out.