Honestly the .338 is going to slay moose with whatever you load it with. Really, it will come down to whatever bullet you like. I use 250 gr Sierra Gamekings; some guys don't like them because they aren't a "premium" bullet, but they carry over 2000 ft/lbs out past 500 yards and they've never failed me, and my rifle puts them in one ragged hole at 50 yards, under 0.75" at 100 yards and into a cigarette package at 300 yards. I've never recovered one because they always blow through the moose, even on quartering away shots through the boiler and the thick part of the front shoulder. So...I like them and use them...many guys would consider them lesser bullets to some/all of your choices. If you have one of your bullets that "feels" right to you, go with it.