I use the 300 grain SMK in my 338 Lapua in Lapua brass ahead of 92 grains of H-1000 lit by Federal 215M primers for 2800 FPS out of my Rem 700 action shot in a Rock Creek 5R cut riffled barrel 1 in 10 twist.
I went with the Lapua because of the quality of Lapua brass and the basil ability of quality match grade factory ammo.
