The 44 Magnum and the 45 Colt are fantastic deer cartridges.
Do not pay any attention to anyone who uses the energy theory in shooting deer. It is plain wrong to think that way. If energy was the only part of the equation then how could a bow be an effective weapon??
The 44 and 45 are both easily capable of 200 yards kills. And they kill effectively at those ranges.
Most people who say this is not true, are people who have never hunted with these cartridges.
The 44 and 45 with minimal expansion makes a 1/2" hole(or larger) through the deers lungs. The only energy needed is enough energy to punch through to the other side. And how much does that take?? Not that much!!
The beauty of the 44 and the 45 is when you cast and reload your own ammunition. I can cast and reload 1,000 rounds or more for less than $100.
I promisee you that if you put a couple of thousand rounds through any 44 or 45 rifle you will have no problem making effective hits at distances way past 100 yards. And after you shoot that many rounds through your Marlin you are just getting it broke in. The rifle is capable of shooting a lot more rounds than that.
I can load a 300 grain bullet in a 45 Colt that can rival or exceed the older 45-70 loads(in a rifle). Did you ever hear a person say the 45-70 was an ineffective long range cartridge?? If they say that then they don't know what they are talking about.
As far as the Marlin 1894 is concerned. I personally think it is a great rifle. I prefer the same cartridges in an 1885 Low Wall. But that is personal preference. The 1894 is easily accurate to 200 yards in 44 or 45 cartridge, even with open sights-which I prefer for fun hunting.
Personally I do not like the Marlin in SS-only because they use a polished SS, and I think that is too shiny. I would buy the blued model(I have a few).
The trick to a pistol cartridge rifle is practice. And shoot a heavy bullet with a big meplat. Those cartridges make a big hole. And you can normally eat right up to that hole. Pay no attention to the naysayers, buy one, buy a mold, learn to cast and reload, and never look back.
Another good thing for you Indiana guys is the TC Encore. They are very accurate in pistol cartridges. And you can get a 357 Maximum barrel that can almost rival the 30-30 in a rifle barrel. Tom.