For those who don't know, TSS is a metal alloy comprised primarily of tungsten. It has a density of 18 grams per cubic centimeter, is harder and twice as dense as steel, and is 50-percent denser than lead. This means increased velocity retention and penetration. Hardness also prevents pellet deformation, to improve pattern efficiency and penetration. Because of its greater density, one can use a smaller TSS pellet to deliver the same amount of energy as much larger lead or steel shot. This means one can increase the pellet count of a payload by using a smaller shot size. Finally, TSS is certified non-toxic by the U.S. Fish and Wildlife Service, so it can be used for waterfowl hunting.
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