Kennisondan,
As others have said, the .45 Colt @~ .44 Mag. levels is all you will need if you hope to avoid extreme recoil. My original .45-70 12" Hunter Contender barrel runs a 400 Speer @ 1360 fps for an everyday load, but the recoil after a few rounds is not fun. It will make your T/C Contender .35 Rem. feel like a pop gun. It's great for Buffalo size game, which is all I've used it for, but not really "necessary" otherwise...just fun.
With regard to the .35 Rem., killing power and trajectory @ 150 yards is just fine for deer and black bear sized game, assuming you run it @ close to 2000 fps mv with handloads. A 200 gr. (and even a 180) really takes a plunge between 150- 200 yds., so the trajectory can be a problem. The .35 Rem. is a great handgun cartridge, particularly in a bolt gun, like an XP.