Well noted. I read in the Hornady manual that the H-335 I have been using is very stable in extreme temperatures both ways. I am pushing a 500 grain A-Frame at 2150 according to the book. It is very accurate in my gun. The load is slightly compressed and works well for me. It was their most accurate powder choice. I an using Alliant RL-19 in my .375 ruger with a 300 grain A-Frame. I will probably use factory solids in both rifles.