Don't ever let anyone tell you that the .458 Lott is a serious cartridge and the .458 Winchester Magnum is not.
Both of these will beat a SAAMI .458 Lott for higher velocity at same pressure.
Both are better at lower recoil loads too, if such is desired.
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.