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

Yes, that 250-grain Monoflex at about 3000 fps might be useful, and variety is the spice of life, eh?
Certainly would be nice on the shoulder even at 3000 fps, especially if it can be done with less powder weight like with AA-5744.
That would be a different kind of "reduced load" at 4996 ft-lbs of KE.
At Ammoguide.com there is a compressed load with 80.0 grains of ADI AR-2207 (same as H4198)
that made the Monoflex go 3010 fps from a 24" barrel.
COL was not reported there.
That would be 5029 ft-lbs KE.

For inspiration:



Use a Lee Factory Crimp die, with or without the extra cannelure made by a canneluring hand tool.
At 3.340" COL, the H4198 would not be much compressed.
The AA-5744 will not be at all compressed yet full enough to avoid temptation to use a filler.