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Lead dust from the bullets is an inhalation problem. Depending on the type of catcher used at the range. Sand presents probably the greatest problem. As bullets strike the sand it abrades the bullets and spall which is all ready present and literally grinds grinds it into smaller fines.
The bullets also kick up lead dust and it will be suspended for a period of time.
Depleted uranium is considerably heavier than lead. While working at a defense contractor We found significant levels of airborne DU up to 8 hours after after all production had ceased.
In another operation we added lead powder to an insulating material. The powder would coat the entire mix room.
Lead dust is a real inhalation problem.
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