I like it fine. With the shorty Katahdin 50cal barrel it shoots great. I use 80-90gr of Blackhorn 209 powder and a 44cal bullet in a sabot. For hunting I use XTPs, but for "plinking" I use the 44cal bullets I cast for my 629.
Make sure you're looking at an actual Encore with BP barrel and not one of the Encore-pattern BP-only rifles. The former will require a background check because it's a firearm, but the latter shouldn't.
Chris