The use of lead...
...is not prohibited, just highly regulated.
As long as the lead fume (more or less the same as smoke) is not inhaled, and as long as any contact lead (on hands or near the mouth before eating) is properly controlled, you can sling lead around with gay abandon. The trouble is that no one wants to spend the money to do it right.
(If you ever have occasion to handle lead (as in lead pipe, lead bullets, even fishing sinkers made of lead), the standard approach to deal with the hazard is to 1) avoid melting the stuff; 2) clean up thoroughly after you use it (the dust shouldn't go in the general waste stream, but some small amounts are going to slip through, so I wouldn't worry); and 3) wash up thoroughly before eating or smoking.)
Back in the early 1970's, I once visited (in my then-capacity as an OSHA inspector) a place that made "lead wool". Lead wool is like steel wool - fine wires of elemental lead, used to pack soil pipe joints in old style cast iron plumbing. In order to make the stuff, they poured molten lead into a large tank over a pool of water. The streams drizzle into the water and solidify, forming lead wool.
The plant was like something out of the 1940's - everything in the place was ancient. They were so far out of compliance with regards to the lead standards that regulated such stuff as to be hopeless. Employees were eating while they worked, there were no clothing change facilities, and there was enough settled out lead dust to poison half the population of East Saint Louis if it were to become airborne.
Worse than that, about half the worker had the dreaded "lead line" that shows up in lead poisoning victims. The management of the place was pretty clueless, although willing to do the right thing - if only they could afford to do it.
These days, the monetary penalties for all of this nonfeasance would have run up in the hundreds of thousands of dollars. But, that was back in the days of the nickel and dime penalties. Hopefully, they spent what they saved on fixing the problems.
We also had a secondary copper smelter that purchased the earthen butts behind short-range rifle and pistol ranges. The massive earthen butts were scooped up, replaced by new mounds of earth, and the butts were transported to the plant south of Alton IL where the earth was sifted, the bullet content extracted, and then melted down for the copper content of the jacket.
The lead portion of the content was dumped in huge piles of slag outside of the plant. The plant has been closed for fifteen years or more, but the huge piles remain.
Incidentally, the Base Closure and Realignment Act (the government law that regulates the closing down of excess-to-requirements military bases) spends massive amounts of money cleaning up old Army posts of pollution.
You would think that the main problem would be something like depleted uranium rounds, but no. The problems mostly lie in the small arms ranges with 300+ meter target distances, as the lead bullets (metal jacketed, but the jackets fail over time) fall over extended distances - very hard to clean them all up.
