Reference the Black Diamond XR... I have shot hundreds of rounds through mine. It is just hands down, a great shooting rifle. It is also a dirty fowling rifle, but that's all part of the game to me. The only time you need to break them down is if you're sitting on the range and have shot about twenty rounds through the thing. They striker and breech area will fowl bad, and slow down if not even stop. So you pull the striker, wipe it clean, check the breech plug since you have the rifle open so nice, wipe out the breech area, and you're good to go for another twenty rounds.

I do check the breech plugs on all my rifles every 10 shots. I just give them a little twist. Just to make sure they are not seizing up.

Also like Sabotloader was saying, don't overlook sidelock rifles. Especially in your case. Get a large caliber like a 54 or bigger and shoot roundball or conicals. It is all you would need for deer or elk. Lyman makes a Great Plains Hunter model with a 1-32 twist that should be an excellent conical shooter. I have a Lyman Trade rifle with a 1-48 twist and it will shoot powerbelts excellent actually. Also it does real well with maxiball and roundball. Thompson Center makes some great sidelock rifles also. My .54 caliber Renegades, there is not a bad shooting rifle in all four of them...