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Go with the .45-70
You don't need anything more than the 45-70, even if you want to go for big game. They were useful then, and still are.
You should be able to get well over 1000 fps with it. I haven't chrony'd mine, but have read of guys getting 1250 fps or more.
I have the Pedersoli Sharps, bought in 1996, and absolutely love it. I don't shoot it as much as I should, but am just getting back on that wagon.
I shoot the Lyman 457125, at just over 500gr, and have never been able to get 65 grains of powder in the case with it.
Remember, that a large part of the fun of these rifles is exactly that trajectory. If they shot flat, there wouldn't be much in it.
Also, expect to spend a fair amount of time working up a load with different powders, compression, lubes and bullets. You will likely want to cast your own, so you can weigh them and throw the porkers back in the pot instead of spending money on them.
Cheers,
Chowmi
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