Reply #18: There already is

[Superfly]

for example, due to Federal legislation back in the 60's or 70's, all waterfowl hunters had to switch to non-lead shot so that ducks and geese, when ingesting pellets, are not poisoned and die slowly.

As a result, all waterfowl hunters in the US use non-toxic, non-lead shot, such as steel, tungsten, and bismuth.

The Army is adopting "green" bullets, ones that decompose over time without toxicity, but still deliver the necessary downrange performance.

Brian