I spent countless hours testing chokes attempting to get the Federal HW to get consistent patterns.
I'm sure no where close to what Clark has done, But The TrueLock choke out shot all others. I have the choke in my remingtons and my Super x-2.
I can say that I am very pleased with the choke. I can put up 180"s in my 3" guns, and over 200 in my 3.5 guns. The Federal HW #6 shot also produces expectable patterns through this choke.