At least for now, the EPA has been shut down on attempting to ban lead in bullets under the Toxic Substances Control Act:

(05/27/2013) Federal Judge Emmet G. Sullivan dismissed CBD’s lawsuit, finding that CBD’s current petition was nothing more than an attempt to seek reconsideration of their previous petition, which the EPA had denied. Judge Sullivan also indicated that he would defer to EPA’s determination that the agency was not congressionally authorized to regulate lead-based ammunition, according to the Institute for Legislative Action of the NRA.

We'll see what the future holds. But the EPA and/or environmental groups are 0 for 3 (at least) so far in their attempts to ban lead in ammunition.

LINK