And you probably can guess which I would pick...
No question, I would opt for the .45-70. I'd go for a single shot over a multishooter like a Marlin lever gun, but either way, the .45-70s rules.
As a single shot, it is a lot friendlier for shooting with blackpowder, and who wouldn't want to do that? You could also build yourself a real "beanfield rifle" if you wanted. The .45-70 has the power for any range that you are capable of. I'm not so sure the .450 would be much of a long range rifle. I am not aware of the rifling twist in .450 barrels, but I would wager it is very slow in comparison to even lever rifles in .45-70. Singleshot .45-70s are usually barreled with an 18" twist and will handle bullets well in excess of 500 grs for true long range capabilities.
That said, i don't see Iowa outlawing ARs anytime soon, but that would be a might clunky hunting rifle for sure.
I will completely second all of this. My first western hunt was done with a 45-70 loaded with black powder. They sure put the wallop on animals. the ole gal on the right has some miles on it!
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