I did some reloading last night for load development in my factory model 700 in 300 win mag using Berger 215s and H1000. I started at 72 grains and decided to test at .04” off to begin with. I did 1 grain increments up to 77 grains. At 73 grains I could here the powder just barely crunching. By the time I hit 77 it was really packing in there and the bullet seating depth was changing due to the compression. I’m using new Sig Sauer brass that I sized and neck turned. I’ve never encountered a compressed load before, is what I’m seeing normal? I figure my OAL is probably quite a bit shorter than custom throats but I’m at 3.55” OAL. Am I running out of case capacity because I have to seat the bullet so far in?