Actually, one of my go to loads in my 45-70 Marlin Cowboy is that same 420 grain Lyman FP 457193 over 70 grains of Goex 3f Express. It shoots really well in the Marlin as well as my Sharps and Remington rollers, but this 1886 wouldn't touch it. It was the first or second load I tried in the '86, as I keep a hundred or so loaded up.
That is an effective load, accurate and more than powerful enough for elk, yet the recoil level is low. I think it is really a good load for these light lever guns.
