The only places I shoot indoors are Mass Rifle and Woburn Sportsmen's.
Both clubs put a lot of work into maintaining their air handlers, both have HEPA filters. WSA does smoke tests to make sure the airflow is correct. I don't know if MRA does that, but subjectively, the airflow is consistently downrange and not floating around the shooters' heads.
In February of '19, based on other people at MRA wearing respirators and some people at WSA not shooting indoors, both because of high lead levels, I got tested. I was at 10mcg/dL.
The "we should do something about that" level is 5.
Six months later I was at 8.
In 2020 I did far less shooting, and almost none of it was indoors. In January, I was at 3.
So, I'm getting lead exposure *somewhere*, and the most likely culprit is something gun related.
Because I was shooting a lot less, I also was reloading a lot less (almost none), and I changed my case prep routine by moving the entire process outside. I used to do it in the basement or garage. I did this because primers have lead compounds in them, and I didn't want to risk getting that shit into the air where I could breathe it.
Now, I don't know for sure where my exposure was; it might have been either of the ranges (their filters aren't as good as they think) or from reloading (case prep) but I *DO* know that until I figure it out, I really want to keep on top of my lead levels.
Yea, or I could say I do stained glass with lead caming.
But I'd rather not have to lie to my doctor. One lie can lead to another if he asks to see my stained glass or starts talking about fishing. That's not a great relationship to have with someone with whom you need to have open unfiltered conversations with generally.