I have a area at home with 40ft straight run.
I have been using a CO2 BB pistol with no issues,BB,s being stopped by large carpeted box.
I went with BB,s to get away from any lead issues,although i feel the box would stop any spatter or dust.
Do not know about lead contamination leaving pistol though.
The BB is good but accurscy is not the best by far.
Can you see a CO2 pellet pistol being a lead problem for home use.
Safety wise all bases are covered.no doors lead onto the fire line and i would be aware of any person at home,they would need to pass me to be in line of fire.
Only safety concern is lead or toxic dust/particles