Anyone care to conjecture what the pressures might be,
of this ammo fired in a SAAMI-chambered .458 Winchester Magnum ?
I know one thing for certain:
The pressure will be lower than when the same ammo is fired in a SAAMI-chambered .458 Lott.
Kids, don't try that at home without adult supervision.

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That is from a 24" factory-barreled Ruger No. 1 at 80 degrees F.
Both loads with 83.0 grains of AA-2460.
500-gr TBSS at 3.550" COL,
450-gr TSX at 3.570" COL, just so as to be less than the .458 Lott max COL.
Either WW-Super or Hornady .458 WinMag brass may be used.
If you use Norma brass the COL may be shortened by 0.1",
thus 3.450" and 3.470" respectively,
which makes the Lottites even more envious.
That will fit inside the Sunny Hill drop box for a standard-length Mauser M-98, FN or Whitworth Mk X,
no weakening of action required.

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.