SAAMI .458 WinMag, 3.340" COL or less, 60K psi or less, 24" barrel, WW-Super or Hornady brass:

500-gr Trophy Bonded Sledgehammer Solid ... 2200 fps
450-gr North Fork FPS or Barnes TSX ... 2300 fps
404-gr Hammer Bullets Shock Hammer ... 2400 fps

Add 200 fps across the board for the .458 WM+ and beat the .458 Lott, if both are allowed up to 3.600" COL and 62,500 psi.

Neat trick:
Establish loads in WW-Super or Hornady brass for 3.450" COL,
then transfer same loads to Norma brass for .458 WinMag at 3.350" COL.
Very close to same effective case capacity with both cases,
and both loads are still .458 WM+ in both cases, pun intended.
The Norma-cased loads will fit in a blocked-box M70 or standard Mauser, etc.

Top .458 WM+ loads with any bullets will be obtained by using the greater-capacity Norma brass
and proper COL and proper powder at proper compression for just right pressure.
To be continued.

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.