I've taken black bear with a Super 16" 45-70 Contender. I've also taken deer and wild boar with the same barrel. It wears a 2x Burris.
Since you have the Encore, a 12" .454 Casull barrel would be close ballistically speaking. The gun could also be used for deer as well.
What rifle do you have? Say you own a .308 or .30-06, get a 15" barrle in the same caliber. That way you have ammunition and /or reloading components for the same barrel. I wouldn't go with a barrel less than 15" with any bottle necked round. You lose too much and it becomes a flame thrower.
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