Brybenn, if you're going to use the 458 for everything, you might try to get a good load worked up for a 350 TSX that shoots to the same point or a little high at 100 yds of your 450-500 gn thumper load.
Here I'll even save you the time. Try somewhere between 69 and 72 grains of H4198. 71 clocks 2650 fps in my rifle, and if I were a .375 I'd be getting awful nervous about my "do everything status". I went through 24 of those offhand this morning just settling into a shoot, rip and repeat groove.



















































