With a second from Sir Scotty
and a third (and more) from Sir Dennis,
a telepathic vote has been taken.
The aye's have it.

Resolved:
Woodleigh BENCHMARK (Hodgdon) aka BENCHMARK 2 (ADI) loading data
is henceforth considered to be the standard "Benchmark Load" for comparison of rifles
conforming to SAAMI .458 Winchester Magnum homologation standards.
This may be done without regard to piddly differences in ambient temperature.

This will assume use of Woodleigh Bullets cannelures for actual COL of less than or equal to 3.340",
60,000 psi MAP
24" rifle barrel length
1:14" twist
0.458" to 0.459" groove diameter
Hornady, W-W Super, or Remington brass of 94 to 95 grains water gross,
and Large Rifle Magnum Primer of the F215/WLRM/CCI250 types.

The Benchmark Load will be the baseline for the individual rifle,
indicating its relative speediness.
Differing load characteristics, non-SAAMI chamber, or rifling variations may then be interpreted,
thus facilitating any 'splaining to be done ...
like how the .458 WM+ so thoroughly trounces the .416 RemMag and .458 Lott.

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.