Hunters are up in arms over an Arizona-based conservation group latest bid to get the federal government to ban lead bullets, which the environmentalists claim contaminates the food chain.

The Center for Biological Diversity, which claims 220,000 members, has sent a petition to the Environmental Protection Agency on behalf of nearly 100 groups in 35 states asking the agency to regulate lead right out of ammunition. It’s the second time the group has attempted to get the EPA to take up the cause, and the group is currently suing the federal agency for rejecting the previous bid.