Wrights Superior Chokes. His 20ga tubes are called The Swarm. They currently hold the World record in the NWTF both men and Womens Division. Stewart Wrights chokes hold more world records than the other tube manufactors combined!!!! His turkey tubes are designed to Hevi-13 exclusively. They put 42 pellets in a 3" circle at 40yds using Hevi-13 6shot, 20ga to set the first World record!!!