I'm using RL19 for my 338 and have great results. I havent tried any other powders yet, but the loads I made with the RL 19 are the most accurate I've ever shot.
Skeeter,My standard load for .338WMag is a225gr Hornady/Win brass/Fed mag primer and 74gr of H-4831.Grizzly,moose, elk,black bear and mulies/whitetails have all fallen to this load.[oh yes and one caribou]Harold