Back to basic .458 WM loads with 350-gr Speer "tough enough" bullet as previously suggested, power enough for anything in NA:
And the good-for-lower-velocity loads with the 400-gr Speer, more suitable for .45-70 Gov't.:
400-gr Woodleigh at +2600 fps MV (3.425" COL) 400-ish-gr/.461" Hardcast-GC at 2150 fps MV 375-gr/.461" Linotype Hollow Base at 1400 fps MV The cast bullets are loaded to 3.340" COL, easily seated deeper for same velocities with those:
All have good accuracy in a SAAMI-chambered .458 WinMag rifle with 1:14" twist.
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.