I would prefer to use a modified 12 to 28 insert machined to use the full length of the insert with more thickness at the forcing cone area, or, better yet, get Briley to make you a full length set of inserts custom made to 2" chambers and including screw in chokes in the tubes. It's only money, and one set of Brileys is only about $400. Yes, I use them in double guns.