welcome.
Hornady dies and brass was the only gig in town when I jumped into the 450, no complaints on this end.
Powder, Lilgun for the light stuff (250gr and under) and 300MP or H110/296 for things heavier. I stumbled onto 300MP when it first came out and H10/296 was in short supply. I seems to burn 1-2gr slower and have seen no difference in accuracy between the two. With the bolt guns you can seat the bullets out a good bit and turn the burners on.
Primers, I use CCI 450's, mostly because Remmy 7 1/2's are scarce around here.
Bullets, the FTX's for accuracy but I'm not a fan of them for hunting. Hard to beat the Barnes for hunting althou I've been playing with some Fury Custom bullets last couple of years and Dennis makes some good ones.
http://www.furycustombullets.com/