Carlson's TSS Turkey Choke Tubes are specifically designed to optimize the performance of Federal Premium Heavyweight TSS Turkey Loads, but they also work exceptionally well with other manufacturers' turkey ammunition, particularly with smaller shot sizes (7-9). Federal Premium's Heavyweight TSS Turkey Load features an incredibly high pellet count in both 7 and 9 shot, offering superior energy retention and extended range, making it perfect for .410, 20-Gauge and 12-Gauge shotguns. Tungsten Super Shot (TSS) is 22% denser than heavyweight shot and 56% denser than traditional lead shot, allowing for the maximum number of pellets in a 10 inches circle at 40 yd. The Heavyweight TSS shells come equipped with the Flite Control Flex wad, which gives hunters the flexibility to use any choke tube they prefer, ensuring tighter patterns and better performance with every shot.