Two points:
(1) The ventilation system SHOULD have carried the smoke and powder away from you when the fire extinguisher was deployed. I don't think you should shoot at that range in the future, because you are probably breathing a lot of lead dust.
(2) Even quality American-made ammo leaves unburned powder. I have a deal with the range where I shoot -- I buy primers and powder from them, and they let me scrounge brass for reloading. I shoot .45 Auto, and almost every case I grab out of the buckets has significant amounts of powder left.
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