IF one had a Ruger, or bolt .45/70, I'm sure they could duplicate my in-camp/BEAR load that I have for my .458 2". So far, the bears haven't shown when I've been in the guide's camp. It drives the flat point 560gr. Lyman hard cast bullet (hardened WW) of 560gr. weight at 1,850fps. For those who feel the .450/.400 has plenty of poop, this load beats it in diameter, bullet weight, KO, FPE or whatever measurement is used. fpe is 4,257. While I don't put much if any faith in fpe, I acknowledge than many hunters do, especially when African game is spoken of. I have run 500gr. jacketed up to 4,750fpe with this rifle, but think that 560 flat nose needs some testing and would hit a considerably harder blow. It's cavitation index is much better than a round nose solid. Lyman # 457560.
: Only game we've shot with that bullet, was a bull moose, shot in the chest, the bullet recovered in the right rump underneath the hide. The alloy was 50/50 WW/Pure. Initial velocity was only approximately 1,430fps, driven by a 122gr. of 2F. Range was only 85 yards. The bullet expanded to .756" and lost only 59 gr.
; This velocity range is well within the Marlin's capbiltiy, however bullet length, of course, is a problem in the lever action.