Bismuth/tin is less dense than lead. Doesn’t seem to have quite the smack as lead at the same ranges. (Anecdotally)
Sure it's less than lead. Most non-toxics are. But it's still darn good. And, I remember using lead for ducks very well. Bismuth is a helluva lot better than steel, even the best steel loads, IMO.
Shoots are already paying disposition fees.
You, and maybe somewhat less than 1% of the rest of American shooting sportsmen, are concerned with this. It does not apply to most of us Americans who hunt alone, or with a bud, on public or private land for a few game birds. No relevance at all. But, it sure seems hard for you not to make subtle mention of your forays to England or Scotland when you post. Just how many American shoots are paying "disposition fees", CZ?
