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The floor, walls, lights, and ceiling take a lot of punishment from just wild shots.
A board on the floor would protect that one narrow band from regular targets at the same range.
There are various opinions as to the main source of airborne lead.
Seems a tossup between styphnate primers and fume from powder flame and bore erosion.
Spatter off of a hard target likely too coarse to stay airborne long.
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