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

It's Alive !



Yes, it will allow 2 bands in and 2 bands out of the case for 3.34″ COL .458 WinMag with 2.490″ brass (satisfying SAAMI homologation),
and 3 bands in and 1 band out of the case for 2.99″ COL .458 B&M with 2.240″ brass length (as per MIB homologation).

Let the brass go to 2.500″ long in the .458 WinMag and it becomes a .458 WM+ load with 3.35″ COL, heh-heh-heh.

With the belt and suspenders crimp a 3.45″ COL is possible now in the .458 WM+.
That adds 4.166 grains of water to net case capacity, versus 3.35″ COL.
That is about the same increase in net capacity as realized in using the Norma brass
instead of the other common brass for the .458 WinMag, both at same seating depth.
Sadly, other common brass for the .458 WinMag is not so common lately.
Trim the .458 Lott to 2.5" length whenever possible.
That is like asking the space aliens to eat the Canadians first.
It's a joke, Sir Bob. We all love Canadians here, except for Fidel Castro's son.

That extra 0.100″ of bore-riding nose projection on the 0.700″ version
also will add to effective throat length versus the 0.600″ bore-rider nose.
More effective case capacity or pressure let-off than with the 0.600″ version when both are loaded to same COL.
Might have to use more than 78.0 grains of Benchmark to get it to 2500 fps at 3.350″ COL in 24″ barrel.
Accuracy of the longer-nosed bullet will hopefully be as good as with the shorter-nosed bullet.
To be determined.