I'm not sure but I don't think there's any advantage to high brass shell's anymore. Years ago, pre 3" if I remember right, high brass was used to assist with mag shells and their low base. Anymore I don't think it really matter's as I suspect the base height is pretty much the same in all 2 3/4" shells. There used to be low base and high base, speaking of the base wad inside the shell. Low base used high brass and high base used low brass.