Not 458Win, but 52.0 grains of IMR 4350 with a 200 gr. bullet of your choice shoots to the same zero as the old Federal Premium 200 grain load (and is slightly more accurate) in my rifles. I’m still using up a lifetime supply of Lake City Match brass, so you can likely up the load a grain for domestic, commercial brass. 57.0 grains of the surplus H4831 in the same brass also shoots to the same zero, so seems to duplicate the IMR 4350 load.
The old Federal 200 grain Premium ammo seemed to be loaded with a Sierra SPBT, a “GameKing” in today’s marketing parlance. It was good stuff, hated to see it go, but was glad I could duplicate it. I worked it up before I owned a chronograph, so can’t tell you how fast it is/isn’t going. Deer aren’t a fan.
I chronographed these loads today. As was noted, they aren’t fast:
52/IMR 4350/200 gr. Sierra yielded 2430 fps at the muzzle on my R8
The Federal 200 gr. factory load was going 2510 fps from the same rifle
I didn’t have any of my H4831 loads, or 200 gr. NPT loads to try.
