If the Peterson brass formed to .458 WinMag comes out with smaller case capacity than any other I have measured, seating the bullet out by 0.100" will add 4.166 grains of water capacity for each step. With Winchester, Hornady, Remington and Federal brass, case capacity is 94-95 grains. Norma brass is 99-100 grains. Could Peterson be as small as 90-91 grains ? Even if so, equivalent net case capacity roughly: Norma: ~3.280" COL W-W, R-P, Hornady, Federal: ~3.380" Peterson: ~3.480"
Or use them all with same COL and use less of same powder in the Peterson ... more velocity per grain of powder would come from the Peterson. Less recoil for velocity achieved. Less is more with the .458 WinMag. That is why the Lottites flinch so much.
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.
