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

Preliminaries on the Buffalo Bore ammo, speedy delivery,
and probably best quality "factory" ammo available,
priced well too, considering all that:















The 400-grain TSX is third from bottom above.
The nose projection is a wee bit shorter than that on the 450gr and 500gr TSX.
The COL of the two rounds I pulled apart was 3.310", identical for both.
The brass cases are Hornady and they measured 2.492" and 2.493".
The Barnes bullets weighed 400.3 grains and 399.1 grains.
Bullet Overall Lengths: 1.390" and 1.388".
Call it a 400-grainer that is 1.39" long.
The two powder charges weighed: 75.3 grains and 75.4 grains.
Call that a charge of less than or equal to 76.0 grains of what looks like AA-2230.
That is the median charge in the Western Powders manual for the old Barnes Original .458-400gr SSSP bullet at 3.140" COL:
72.0 grains >>> 2162 fps
80.0 grains (compressed) >>> 2457 fps <<< 53,690 PSI
24" barrel velocities: Interpolating for 75.35 grains gives 2286 fps.
Buffalo Bore's claim is for 2250 fps with the 400-gr TSX.
That will make a bloody big hole in anything needing a soft bullet.