Hopefully this is not your first Deer rifle
I have only fired a 45-70 once. It was a Marlin guide gun with a short barrel. But it kicked like a mule and even though it could stop anything I wouldn't recommend it for most common use Deer Hunting. I think almost all the other choices are a better option for Deer. I personally would recommend any of the following over it
I hope you get the point, lots of better choices.