The proper method is to use SAAMI .458 Lott starting load data for your .458 WM+, and work UPWARD until you beat the .458 Lott load.
The 400-gr Woodleigh PPSN is a guide for future work with the 400-gr T6 bullet made by shortening of the 500-gr TSX.
Any bubba can do it.
The T6 has no impact velocity restrictions, just like the Woodleigh HYDRO bullets.

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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.