Remember that I had the bismuth alloy modified, the normal stuff is pretty terrible for bullets (or shot, for that matter). Bi/Sn alloy in the 88/12 range like shot pellets shatters like glass when squeezed or shocked and makes lousy bullets due to being brittle, crumbly, and tendency to shatter before it deforms. Standard shot and similar Bi/Sn alloys being terribly brittle the reason why I was looking for a better solution for you in the "environmentally conscious" states and found a reasonable (but still not perfect) solution by adding a small percentage of antimony. The antimony increases the malleability, cohesiveness, and flow of the Bi/Sn alloy considerably....and then it shatters. I think the percentage of deformation before crumbling is increased enough in the revised unleaded bullet metal that it would make very satisfactory shot, although it will be about 15% lighter than pure lead (if memory serves....).I'll look at bismuth/tin, I have read accounts of the substance crumbling as it passed through chokes. In Ian's work, it took rifling torquing and shot accurately for him. That question bears assessment, since its cost is less onerous.