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

My pleasure Sir !

To stick the thermometer in the roasted .458 Lott, it would be nice to have more pressure data
comparing the SAAMI .458 WinMag, SAAMI .458 Lott and the wildcat.458 WM+.
Just sayin'.

Ponder this, all Lottites:

To illustrate that the run-of-the-mill 24″ Ruger No. 1 barrel with .459″ groove diameter and .450″ bore
(measured by slugging and pin gauging)
is no slouch,
here are some results with Lab Radar, all same day and 80*F:

Hornady DGS 500-gr .458 WM factory load, claimed 2140 fps MV
MV: 2153, 2134, 2134 mean = 2140.3 fps MV
100-yard: mean = 1866.7 fps

W-W Super 510-gr .458 WM (1990s’ white box) factory load, claimed 2040 fps MV
MV: 2001, 2040, 2065 mean = 2035.3 fps MV
100-yard: mean = 1804.7 fps

Some handloads in same rifle, same day, all with same powder charge: 83.0 gr AA-2460:]

Hornady 480-gr DGX-Bonded 3.560″ COL:
MV: 2408, 2408, 2406, 2404, 2402 mean = 2405.6 fps MV
100-yard: mean = 2087.6 fps

Woodleigh 480-gr HYDRO 3.580″ COL:
MV: 2473, 2471, 2455, 2467, 2472 mean = 2467.6 fps MV
100-yard: mean = 2070.4 fps

Barnes 450-gr TSX 3.570″ COL:
MV: 2451, 2465, 2458, 2457, 2464 mean = 2459.0 fps MV
100-yard: mean = 2221.8 fps

Federal 500-gr TBS Solid 3.550″ COL:
MV: 2419, 2408, 2406, 2401, 2405 mean = 2407.8 fps MV
100-yard: mean = 2106.4 fps

KE at muzzle = 6,436 ft-lbs for the 500-gr TBSS at 2407.8 fps
The .458 WM+ loads in a SAAMI .458 WM Ruger No.1 beats a .458 Lott.
Throat, throat, throat: Free-bore-boost.

Those handloads would make for some interesting pressure tracings at MIB, just sayin’.