Bismuth is gone for the forseeable future. Kent TM is the only Non-Toxic suitable for older doubles that I have any experience with and until the other manufacturers publish technical data on hardness and conduct actual documented testing, is the only source I use/would use. Its very easy to say your ammunition will not do damage to older shotguns but these guns run the gammet of barrel hardness and construction.
BTW my 32" Model 21 Duck is gone, the victim of high prices and more so the difficulty of purchasing suitable ammunition. A pair of Rem 332's using Hevi-Shot has replaced it.-Dick
