Good point, my 22 ammo is lead. However, the only thing I shoot with 22 are squirrels and grouse and I do not leave those gut piles in the field so there is no danger to wildlife from what I've seen.
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Also, for the "You shoot lead .22 ammo so you're a hypocrite types," .22 LR is barely even supersonic. The real danger, as far as dispersal of particulate lead is concerned, comes with centerfire rifle rounds doing several times that speed.