I have been shooting the SBE (with the first pistol grip) (now called Steady Grip) for over 7 years and I have used the extended PatternMaster choke tube for 3 & 3.5 in. shells for Turkey, Ducks, Geese and Sand Hill Crane. I find, with the PatternMaster, the standard distance is over 40 yards. With Kent shells I consistantly group patterns of 95 to 84 percent in a 40 in. circle at 50 and 60 yards. But, please don't just accept what I'm saying, find someone else that has a PatternMaster and have them verify (or Challenge) my information. check the PatternMaster web site