I worked part time and full time at an indoor range, one very poorly designed, I might add. We wore the full bunny suits with OSHA mandated respirator, (which I still have), when working with lead. We had lead sticks every 6 months. I forget what the bad levels were, but mine went up very slightly in the 1.5 years I had working there. Also, the lead you get at the range CAN be flushed away over time. One guy had a high level, (didn't like his respirator...), so was banned from the range for 6 months. That's the best perk of the job, so we made darn sure to never let OUR levels get high!
BTW, that poorly designed, badly ventilated range was closed, stripped, and rebuilt into the much more modern, safe, and clean Marksman II, here in Tucson, AZ.