Originally Posted by Riflecrank
Ah so !

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That will work for a plinker.
FortuneCookie45LC used a soft-cast, PC painted and lubed 340-grainer sized to .458"
as a barely supersonic plinker from his .458 WM, using 16 grains of Unique and no filler.
The Berry's plated bullet should work as well or better.

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AA-5744 might do even better (no filler needed), and don't forget to try H4198 and H4895 with filler.
Speaking of H4895, here is an abbreviated re-run of "No Name Handloader's" work:

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H4895 can be used for just about anything good, bad or ugly in the .458 WinMag.

The 56 grain load gives 4761 foot pounds of energy I calculate.

Retired cat herder.