Does anyone hear use the 350 or 400 a frame in the .45/70 for elk , moose , or the big bears?

I was looking at North Fork bullets the other day and noticed they have a bulet of similar profile to the Swift A-Frame designed for 45/70 velocities. After reading some of the glowing reports concerning North Fork bullets this might be a legitimate option. Wish I could give you some more info, but perhaps that may help some.