My latest EUREKA for the .458 Winchester Magnum is this:

Hornady brass and 0.115" longer COL gives about equal ballistic performance as the Norma brass at the baseline COL.

Example: 84.0 grains of AA-2230 is about 100% LR/Net Fill with 450-gr TSX bullet in the following loads.

Hornady case at 3.680" COL >>> 2469 fps MV in a 25" Shilen-barreled CZ 550 Magnum

Norma case at 3.565" COL >>> 2464 fps MV in a 24" Ruger No. 1 barrel.

Eureka.

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.