I have the same dilemma with the sbe2. I just bought one and was looking for a turkey choke. I've read alot about it and checked on several forums. A bunch of guys are raving about the SRM Terror .655. They claim to be able to put "virtually" every pellet in a 30" circle at 40 yards. I know that Briley is making the extra full tube for the sbe2's. I'm not sure what to do.