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

Here is the HEMO (Heavy Express) barely qualifying on the velocity bracket but easily beats that with more powder added:













Same bullet at increasing powder charge of AA-2460 on a different day and the 3.485" COL
was increased to 3.600" COL for higher MV with more powder,
AA-2460 was not compressed, H4895 was compressed slightly:



I need to look for that 75-grain charge target, to see why I thought it was good, at 2190 fps instrumental velocity from a 25" Shilen barrel.
I found it. It was only a 50-yard target for that chrono session and the 3-shot group was 1.91 MOA (correct MOA, calculated for 50 yards)

544-gr at 2137 fps instrumental, 3.485" COL, 72.0 gr AA-2460: 1.04 MOA 3-shot, 100-yards, 25" barrel

543-gr at 2190 fps instrumental, 3.600" COL, 75.0 gr AA-2460: 1.91 MOA 3-shot, 50-yards, same 25" barrel.

Your barrel harmonics may be different, your mileage may vary, etc.

So, I have neglected to do a NEMO (Nitro Express Modus Operandi) load with cast bullets:
480-500 grains at 2150 to 2200 fps
Shame.
Should be easy to do.