I am using Longbeard XR's in 3.5 #6 shot with the Longbeard Choke from Carlson's. The Carlson's website has them for the new Browning A5 choke system. I can't find anything to complain about.
I also shoot a Jeb choke with Longbeards #4. Have to be real careful when shooting at less than 25 yards, probably only a 4 to 5 inch pattern. Out to 50 yards though watch out Mr. Longbeard.
One more point when I bought my choke last year. I called Carson Choke company to order one of their chokes. I was told I was speaking with someone who said his name and all I remember is it ended in Carlson. He was the most condescending person I have ever tried to talk with to buy something from his company. I quickly said never again would I deal with that company.