I don't shoot a .300 Win Mag but I have 3 brother in laws that do and my father in law does as well. I know with there handloads they are shooting the 200 Grainers. at 3000 to 3050. They are very carefull watching for pressure signs, working up to this point. I like the .300 the best, I myself shoot a .300 RUM but there is nothing wrong with a .338 either.