God Almighty that looks like a hoss! I have shot the S and W .500 Magnum once, and I honestly did not think it was too bad. But the 45/70 looks like it would kick the crap out of you. I like rifle/handgun combos too. I have a Rossi 92 Winchester clone in .45 Colt, and 3 Rugers(One Blackhawk, two Vaqueros) in same caliber. I really like that Marlin of yours!