With that good info from beretzs on H4198 loads for the Hornady Monoflex 250-grainer,
I will use COL of 3.340" crimped on a Canntool cannelure,
starting with H4198 at 78.0 grains and go to 82.0 grains (COMPRESSED)
and AA-5744 at 65.0 to 69.0 grains (NOT COMPRESSED)
unless there is some funny business along the way.
Will use Daisy the 24"-barreled Ruger No.1 .458 Win.Mag.
That will be a total of 30 rounds, nice outing for Daisy.

Will do that when the weather, the stars, and the Old Ladies around here align
to permit firing those full-bore, paper-patched 530-grainers with duplexed BP in Goldie the .45-2.6" SWT Ruger No. 1,
the .458 WIN Twin.
Hopefully same day for both, for the record.

Speaking of the record, here's one more review of another 300-grainer with H4198
before moving on to 250-grainers, new for me:

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Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.