I am working up loads for my new rifle. Rem 700, 26 inch barrel, AI chassis. I am using Hornady brass, H1000, CCI mag primers, and Hornady 208 bullets. I started with new brass and am using RCBS dies. I started at 72 grains and worked my loads up in 1/2 grain. 74.5 and 75 held the tightest...