Home Forums Hunting & Shooting Express Rifles and Big Bores Only The great 458 Winchester. Everyone should own one at least once

Poor .458 Lott, it has a 1:10" twist barrel by SAAMI.
But that is only about two-tenths of one percent worsening by higher pressure and lower velocity,
not nearly the losses due to throat differences,
compared to the SAAMI .458 WinMag chamber in a 1:14" twist barrel of same length.

GREAT NEWS !
Sir "DocM" Michael at MIB is doing pressure tests on the .458 WM+ ammo in a 20" M70 Classic barrel, cut down from 24" factory barrel.
Comparing data on initial loads showed only a 72 fps loss from 24" to 20" barrel shortening.
18 fps average per inch over that range.

I might get his permission to copy and paste his pressure results here ...