According to the load of course Jeepkid but a .458wm has more crack that you would think. You would imagine a .500ne to be more of a "push" as well but them buggers have the crack AND the shove. A .458wm has pretty much the same results as well. Again, all according to the load setup as well as the stock design (felt recoil) and weight of the overall rifle. I would imagine Mercy will be loading his up for optimum results from that particular cartridge.