I can not help those who refuse to see, but as of two days ago, there was an "Army Times" article detailing the effort to produce a "Lead free" ammunition.
Why?
Because it is environmentally sound. The current article refers to 5.56mm, M-855A1 ammo to be used in M-16 type rifles.
Consider, this is not some fringe group internet publication, this is the U.S. Army's site.
Alarmist, perhaps, but REAL.
BTW, the ammo being developed does not use a "Lead free" primer.
Why?
Reliability and shelf life issues.