I was disappointed when GM dropped the drop in barrels for TC. I wanted to get a 32" .58 cal round ball barrel for the Renegade. I could then dedicate all my hunting to a PRB. The 270gr round ball should be fine for elk and bear, and of course will knock the snot out of deer.
Well, I just found this today. I haven't talked to them about a price yet, but whatever it is i'll start saving for one now, and can do this over the winter.
http://www.stonewallcreekoutfitters....ement-barrels/