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The major pathway for lead is ingestion although it can be from inhaling dust. The major ingestion pathway is from water piping through acidic water or water treated with chloramine instead of chlorine. It's possible to get high levels of lead from handling lead and then handling something that goes into your mouth. Latex gloves or thorough handwashing will do fine for removing lead from reloading. (PS. Not a good idea to handle lots of lead if you have cuts on your hands). I wonder about the "handling lead" part since I've been handling lead sinkers, like most fishermen, for decades. I'd bet on some other environmental cause. High levels of lead is more common, and more of a problem, in very young children.
I checked the CDC website and they have very little information on actual lead poisoning cases. They also don't any history of mercury poisoning from ingesting fish except for Japan in the 1950's.
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