I know for me it took a lot of exposure to have my levels go up. i was stationed at Castle AFB in CA and we had a smell semi-indoor range. It was open to the air above the berms and it had no ventilation system other than being open at the top.Back then we had S&W Mod 15-4 and only shot wadcutters. After three years I was identified as having higher than normal lead in my system. I had to stay away from the indoor range for a couple months and only work at out outdoor range until my level went down. I only had to do that twice that I can remember. At Pease AFB we had another indoor range and it was worse that the one at Castle AFB. I never had any problems there because we were shooting the 92F's with FMJ's. Jacketed bullets help a lot in containing a lot of the lead particulate. I know as a kid I grew up with Lead paint on the walls, toys and glasses, bowls and plates. Asbestos in the siding, insulation and ceiling tiles. DDT to kill the insects and smoked 3 packs a day when I got older. I'm still kicking and so are a lot of us in the 50's. :D
USAF Retired, CATM, SC CWP, NH NR CWP, NRA Life/Endowment/Patron
To preserve liberty, it is essential that the whole body of people always possess arms, and be taught alike, especially when young, how to use them... -- Richard Henry Lee, 1787