When load developing for my 7mm Rem Mag I started at 50 grains and worked up in 2 grain increments until I had a few flattened primers at 60 grains. Backed it down to 58 again and worked up to 59 grains at .2 grain increments when I started noticing a bigger MOA. I have since stuck with the 58 grains with the 150 Remington Core Lokt bullets that I plink with.....even though I think I might start to load some smaller loads just to see if that will help shrink the .9 MOA that I am getting out of my Vanguard.