I was told friday by a reputable gunsmith that a 300 win mag is a more effficient cartridge than the 300 ultra mag. He also stated that you couldn't possibly shoot accurate with remington ultra mag brass because it is "junk". I on the other hand have not seen a ultra mag yet that wasn't a stone cold killer and accurate to boot. I really don't care if it takes 93.5 grs. of retumbo to move a 220 smk 3150 compared to 77 grs. to move the same bullet 3000 fps, as long as it KILLS EVERY BIG BULL I POINT IT AT! You might want to do a little research about some of these subjects with somebody with more knowledge than me. Did you also know that a 338 lapua is accurate because it "looks like" a 6 PPC case, interesting huh!!