Carlson's TSS Turkey Choke Tubes are optimized for Federal Premium Heavyweight TSS Turkey Loads but also work exceptionally well with other manufacturer's turkey ammunition (Smaller shot size 7-9). The Federal Premium's Heavyweight TSS Turkey Load has an incredibly high pellet count in both 7 and 9 shot, along with the ability to carry energy further, makes them ideal for 12 and 20 ga. Tungsten Super Shot (TSS) has a 22% heavier density than heavyweight shot and a 56% heavier density than traditional lead shot. It puts the maximum amount of pellets possible in a 10" circle at 40 yds. The 12 and 20 ga. shells will include the FliteControl Flex wad that gives hunters the ability to shoot any choke tube they prefer. Long-range turkeys don't stand a chance. *NOTE- Not for use with steel shot.Carlson's TSS Turkey choke tubes are optimized for federal premium heavyweight TSS Turkey Loads but also work exceptionally well with other manufacturer's turkey ammunition (Smaller shot size 7-9). The Federal Premium's Heavyweight TSS Turkey Load has an incredibly high pellet count in both 7 and 9 shot, along with the ability to carry energy further, makes them ideal for 12 and 20 gauge. Tungsten Super Shot (TSS) has a 22% heavier density than heavyweight shot and a 56% heavier density than traditional lead shot. It puts the maximum amount of pellets possible in a 10 inches circle at 40 yd. The 12 and 20 gauge. shells will include the FliteControl Flex wad that gives hunters the ability to shoot any choke tube they prefer. Long-range turkeys don't stand a chance. Features: Not for use with steel shot