Home Forums Hunting & Shooting Express Rifles and Big Bores Only The great 458 Winchester. Everyone should own one at least once

Yep, some of my WFN/blunt-nosed, +500-gr, hardcast bullets will barely fit inside of 3.340" COL in the .458 WinMag.
And since they are sized to .460" or .461" to fit in a .458" or .459" barrel groove,
for best accuracy and least leading,
they will not even fit into a SAAMI .458 Lott throat at all !!!
I would have to load them to a little over 2.8" COL in the .458 Lott.
Deep seating, heh-heh-heh.
The SAAMI .458 WinMag opens a can of whoop-ass on the SAAMI .458 Lott again.

BTW, to Sir Bob, when comparing the .375 carts:
The only homologation of the .375 Weatherby that I am aware of is by CIP and the Pmax there is 4400 bar = 63,800 psi.
.375 H&H is 4300 bar = 62,350 psi, by CIP Pmax.
The SAAMI homologation for the .375 H&H: Pmax = 62,000 psi (and the older spec was 53,000 CUP)

That brings us back to the .458 WinMag versus .458 Lott homologations.
SAAMI .458 WinMag: 53,000 CUP and later refined to 60,000 psi
SAAMI .458 Lott: 62,500 psi, necessarily pumped up to allow it to compete with the .458 WinMag.

CIP Pmax for both .458 WinMag and .458 Lott is 4300 bar = 62,350 psi, and that makes good sense.
The CIP .458 Lott chamber eventually got revised to match the SAAMI .458 Lott's short and tight throat, nonsensical as that is.