 They are also generally safe to use in older shotguns with barrels and chokes not rated for use with steel shot, such as for bismuth and tungsten-polymer (although not tungsten-iron) shot.The increase in performance of "heavier than lead" non-toxic shot comes at a higher cost.Boxes of such non-toxic shotshells can cost upwards of $40 (2013) a box for twenty five shells, compared with less than $8 per box (2013) for lead pellet shotshells.