Federal Premium® Heavyweight TSS™ Turkey Shotshells deliver tight patterns of dense tungsten shot on target for maximum penetration at long range. TSS (Tungsten Super Shot) uses a tungsten-alloy with an 18 gm/cc density, which is 22% higher than standard tungsten and 56% denser than lead. The pellet's greater density results in greater downrange energy transfer and deeper penetration. An advanced buffering material aids to keep pellets concentric for maximum retained velocity and true flight. Heavyweight TSS turkey ammo utilizes Federal's FliteControl Flex® wads that open from the rear for controlled release of pellets, resulting in consistently tight patterns. FliteControl Flex wads function equally well in standard or ported choke tubes.