I have never owned a muzzle loader but someone is offering to give me a TC .50cal Renegade. The problem is that the barrel has internal rust/corrosion. When a .50 cal maxi is loaded, it goes down the barrel snugly but when it gets to the ignition chamber it seems loose. So I'm not sure if the rust/corrosion has eroded the steel in the chamber and not sure about using it. Is this okay.Does TC sell replacement barrels. Thanks