I picked up some 225 grain projectiles but cannot find load data for them. And before you ask, yes they are .458s. I found a couple loads but they use IMR 4198 and RL7, neither of which I have or can find. I do have H4198, H4895, IMR 4895, Unique (i know 15 grains will work for a mild load but leaves a lot of empty space), 3031, Benchmark and quite a few pistol powders.
Fyi.....these are the dreaded J word