Duke,

I've only shot factory 45-70 loads out of my SSK barrel. It's 4 port magnaported and it makes no never mind. I think JDJ himself once said, "Like holding a tiger by the tail" After 6 shots at the range, you're done, cause you know what's coming. If my first 2 are good, I'm done. I can say with certainty, any deer I ever hit with this round was toasted. One taken at 15yds was impressive.
I'm dialing back a bit with the 35Rem. It's a great shooter and mild compared to the 45-70. Nice 200 grain pill for a great woods round.