Get a barrel from SMI. They use Douglas Premium grade barrels. Bullberry also makes a top quality ML barrel for the Encores but its very expensive.
The SMI Encore barrel is rated for smokeless powder but works fine with all subs also. They are only offered in blue but if you use smokeless, its not an issue. Smokeless is by far the easiest to clean. It does take a long time to get one though but they are worth the wait.
http://www.smokelessmuzzleloading.com/
