For what it's worth, I'm loading 42.5 grains of IMR4064 with Sierra 175 Matchkings and 180 grain Gamekings. Remington brass, Remington 9 1/2 primers, 2.225 base to ogive. Sub half minute of angle accuracy. This is a max load in my rifle, 2,580fps from my 20 inch Savage barrel.