BENCHMARK might be a good one for 400 to 500-grainers. It has about best ThermoBallisticIndependence from overall take on published trials. It would be good to make up a load that gave about 2150 fps with 500-grainer 2250 fps with 450-grainer 2400 fps with 400-grainer from a "standard .458 WinMag rifle." Benchmark Loads, pun intended. Used as standard measuring sticks for comparing MV of different rifles of whatever barrel length/twist/groove/etc. at whatever temperature.
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.
