Hooray ! Pac-Nor shipped my barrel yesterday. Ought to be here by Halloween to become a .458 WM+ on an FN Mauser action. Same rifling as on the .458 B&M+, but is a no. 5 sporter instead of no. 4 sporter. That will provide another comparison of short barrel to longer barrel for velocity. This assumes the .458 B&M+ with 3.000" COL is equivalent to the .458 WM+ with 3.260" COL, etc.
10-4 on the big Pac-Nor, that'll make a dandy on that FN 98.