jj raises a good point, the talk about lead shot in lakes, or lead bullets in range berms being "hazardous" is a load of crap.
Fish and water fowl would die if they ingested the same amount of pebbles containing no lead. The solid form, such as shot, or sinkers is not what creates the hazard, it is unvented fumes, ( I would bet jj has good ventilation in his casting area ) and soluble forms of lead such as used in old paints and other chemical processes that create a danger.