Carson's new TSS Turkey Choke tubes are made to give you the best pattern with Federal Premium Heavyweight TSS Turkey loads but work well with other smaller size shot turkey loads as well, from 7 to 9. This choke tube is made to put the maximum shot in a 10" circle at 40 yards. Carlson's choke tubes are among the best in the business, and provide dependable service for a lifetime to their owners. High quality steel and tight tolerances ensure the best possible patterns in all of your shotguns. Carlson choke tubes will never let you down! No Steel Shot Larger than #4 may be used in Carlson's Turkey Choke Tubes.