Those NF are beauties, my fave for big and bad game.
The 450 grain .458 loaded to 2150 fps proved to a one -shot-wonder on ele and several Cape Buff a few years ago on a Problem Animal Control outing in Southern Africa. Frontal brain shot on ele shot through head and on into body - DRT. Same load shot through most buff. Not a Magnum, just the old 1886 45-90.
CRS, NRA Benefactor Life Member, Whittington Center, TSRA, DWWC, DRSS Android Reloading Ballistics App at http://www.xplat.net/