Hey guys, i have been shooting my 30-375 ruger and i am having to reduce my loads to keep within the same pressure. My normal load was 80.5 gr of n570 and am now down to 78.5gr. Everything is the same, brass,powder lot, etc. Ive cleaned everything and still getting more overpressure. Last night i fired 4 rounds waiting in between a couple minutes. And on the 4th shot. My primer was completely flat and had to hit the bolt back with my hand. The first shot had absolutely no flattening and extracted very very smooth. Im puzzled? Never had this happen.