The Bergara replacement barrels are the best deal going for turning an Encore into a muzzle loader. Plus it's longer in length. It's drilled & tapped for sights which aren't included though.
Save money with the Bergara barrel to buy the specialized muzzle loading tools, accessories, stock adaptor etc... needed to accomodate the Encore muzzle loading system.
Or else it's simply more cost efficient to buy a TC Omega for $300 or a TC Triumph.
There's a Bergara barrel video too. Make sure to ask the seller what else is needed to install the barrel and to get it shooting.
http://www.bellmtcs.com/store/index.php?cid=455
This outfit has many of the related muzzle loading items like a ML stock adaptor screw, breech plug removal tool, etc...
http://www.cainsoutdoor.com/
Cabela's charges $299 for a blued barrel without the forend with free shipping until 12/2.
Cain's charges $315 for a camo 209 X .50 barrel.
Cain's and Mid South has the Omega for ~$300.
http://www.midsouthshooterssupply.c...ADING&dept2=MUZZLELOADING RIFLES&dept3=50 CAL
It all boils down to how much you like how the Encore handles.
You may need a special muzzle loader fore end or adaptor to hold the ramrod with the Encore. But the Omega is all set up to shoot except for the scope mount. The Omega doesn't have the QLA barrel, but the break action Triumph does and also has the easy twist breechplug. The Triump is probably the most accurate out of the box with the least amount of fuss, but it doesn't have open sights. Mid South offers a fairly good deal on it at $377.