Any loads for the .458 WM+ can be used in the .458 Watts Express, but may not be safe in a SAAMI .458 Lott, heh-heh-heh.
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.