If it's legal in your state, it sounds like you would be happy with a smokeless muzzleloader. I went down the same path last fall.
This is what I put together:
Remington 700ML Action
Arrowhead Sporting goods breech plug
28" Brux 1/20 Twist 45 Cal with straight flutes
Jewell Trigger
McMillan Game Scout
It's the middle rifle:
I shoot the Parker 270 Emax(sized with a swing lock die) over 70 grains of Hodgdon 4198. I'm getting 2828 fps(according to the Labradar) with this combination. After a bit of shooting at the range, I plugged all the numbers into my Gunwerks BR2.
I put this in a MDT Chassis while I was waiting on McMillan to deliver the Game Warden. The first night I had it out, I shot a doe at 405 yards. It was a heart shot. She made it about 25 yards. I shot another doe the next day in the lungs at 85 yards. It was a pretty devastating hit, and she just fell over.
Our alternative methods season in Missouri is getting ready to start back up in a couple of weeks. I'm looking forward to getting this back out to hunt.
If you are looking for more info, check out Doug's Message Boards or contact Luke at Arrowhead Sporting Goods.