"Lead is removed through a process called chelation, using drugs to bind to the metal in the bloodstream, flushing it out in the urine. Medications include calcium-disodium (EDTA), which is usually administered intravenously over several days in a hospital, and succimer (DMSA), which does not require hospitalization. Succimer (Chemet) has become the preferred chelating agent for less severe cases because it can be given by mouth." - HealthScout.com
I guess if you have access to a hospital supply room and an IV then you're straight. Otherwise, a trip to the doctors might be in order. I don't know if dying from lead poisoning from a pellet gun really qualifies as being natural evolution...