Just a data point here, an acquaintance of mine gave himself lead poisoning by visiting the shooting range too often for target practice. I think he wears a breather when he goes now.
Yep, also a reason why I refuse to take my children to an indoor range. Lead dust gets everywhere, I also keep separate set of shooting clothes which I wash outdoors to avoid contaminating my children's clothing.
Wow -- how often for how long were/are they going?
I don’t know how much their exposure was but I’d estimate they are closer to the skinny edge of the bell curve.
Maybe they had especially bad practices, like never washed their hands, exclusively eats finger food after picking through their spent bullets and licks their fingers?
Lead dust settles everywhere, gets into your lungs, especially if it's an indoor range.
There was a recent study which found child blood lead levels were higher in areas with high gun ownership after controlling for socioeconomics.