The rifle you have was considered one of the better long range rifles every made. I have one and it has impressed the devil out of me. Also as far as weather proof, I have little doubt that the Knight you own is ready to handle bad weather. Like already mentioned, those kind of ranges you are hoping for are pipe dreams to many. 95% of the shooters out there, would have no business trying such a shot. The amount of time on the range people spend to effectively shoot those distances would shock many muzzleloader shooters. Also while muzzleloaders have come a long way inballistic ability, they are not a center fire rifle. There are some limitations to all these rifles. I personally would limit my distances to much lessthen they your expectations, but then I will not tell you how to hunt.

The only advantage to the Savage as I see it is, besides being a beautiful looking rifle, you do not have to clean them "right away." Other then that, I would not sell the one you already own short.... Although I have no hands on experience with a Savage.

Good luck hunting. Just maybe try and wait them out or let them get a little closer before you shoot..