RE: Thompson Omega vs Encore Dilemma
Amen. I have two Black Diamonds and an Omega. I have shot all three extensively and checked all three barrels with the Hawkeye bore scope. Don't think there is any significant difference in them, and also doubt if the Pro Hunter has any better barrel either. In fact, the 26" Black Diamond XR is the best shooter of the three.
The barrel swap concept on the Encore sounds pretty good, at least on paper - but that would be the only legitimate excuse to get one in my book. As a muzzleloader, I don't see any upgrade from the Omega.