The FIRED primer contains lead styphonate. The only time you have to worry about lead exposure is while depriming fired primers. If you use a tumbler, the media used will have some of that lead styphonate in it. Care when emptying the tumbler, avoiding the dust is a good idea.
Bare lead cannot be absorbed through the skin. Jacketed bullets have lead inside them, those with exposed lead tips have the potential to get on your hands. Like said, simply washing your hands is all that's needed.
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