I would be FAR more concerned about the hormones, antibiotics and other crap that feed lot cattle have in them, as compared to agenda driven "studies" saying that "Lead bullets are bad, mmmkay".
It is just another incremental way for the liberals who preach peace love and tolerance (as long as you like what they like) to chip away at hunting and gun owners. One more slice of the pie that they take during their "Just Compromise" strategy. Eventually there are no more slices left to compromise over.