Sir Jerry did 2368 fps MV with the 500-gr TBSS in a 24" JES barrrel using 83.0 grains AA-2460 50 degrees F WW Super brass F-215 primer 3.545" COL KE = 6225 ft-lbs
Now we have 2504 fps MV with the 450-gr TSX in a 24" Ruger No. 1 factory barrel using 83.0 grains AA-2230 87 degrees F Hornady brass F-215 primer 3.565" COL KE = 6265 fps
The Hornady brass jumped out of the Ruger No. 1 chamber when the lever was dropped.
I consider both of those loads to be MAXIMUM for the .458 WM+ when limited to 3.565" COL. What are their pressures ? I do not know, except that they are at less pressure than would be required to equal them with a SAAMI .458 Lott.
Some cartridges with 65,000 PSI SAAMI MAP: .22-250 Remington .270 Winchester .300 Weatherby Magnum .338 Lapua Magnum .375 RUM .416 Remington Magnum
CIP homologation for the .338 Lapua Magnum allows it a PTmax of 4700 bar = 68,150 PSI
Now back to 480-grainers at 1300 fps to 2200 fps for gentlemanly and tropical loadings way less than 60,000 PSI, effective killers emulating the full range from BPCR to the .450 NE, with the SAAMI .458 Winchester Magnum.
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.
