Before re-barreling a wondrous .458 WinMag to faster twist, for King of Two Mile competition,
I figgered I should spiff up a disappointing .458 B&M that already has a 1:10" twist PAC NOR on it,
by giving it a SAAMI .458 WinMag throat and loading it to a COL of 3.340".
It will have the same net capacity and load capability as a .458 WM+ loaded to 3.6" COL.
Thus shall be born the .458 BMW.
Even with the 19.75" barrel length and 3.00" magazine length and rebated rim cases,
it should serve as a surrogate for load trials, by single-shot loading.
Hopefully the slightly fatter and shorter case of same gross capacity but with slight bottleneck
does not cause any unpleasant surprises.

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The Barnes data above is for .458 Lott with 26" barrel length.
The .458 WM+ and .458 BMW ought to be capable of doing at least that with 24" barrels.

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.