A similar request was denied by the E.P.A. in August 2010. But Mr. Miller said that the new petition includes a larger consortium of groups, including some made up of hunters, and cites recent research demonstrating that the toxic levels of lead in bullets and shot cause significant poisoning of birds nationwide.
Their last effort foundered on the problem that the EPA is explicitly denied the power to regulate ammunition. Neither the size of their consortium nor their new research addresses that legal prohibition in any way.