Quoted:
Quoted: you'll need a damn good ventilation system unless you want to get chronic lead poisioning...
or just use lead-free ammo.
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The majority of lead exposure is not from the actual bullet. Lead exposure comes from the Lead Styphenate which is the primary compound found in almost all primers made today. So lead free bullets would not reduce your lead exposure.
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+3,000,000
Ventilation should be your primary concern, to the point where there is a constant breeze on you, pushing everything AWAY (downrange) of you, and away from the house. This would mean a vent at the end of the tunnel somewhere. The fan(s) should be running for at least an hour or two after you exit the range, and the route to the house should be airproof.
Of secondary concern should be two things; bullet trapping, and sound insulation.
Of tertiary concern should be target retrevial.
Lighting, proper lighting, should be somewhere in there as well.
If you're doing small bore...well, depends on the small bore
Technically a .223 is small bore...so I'd build/engineer a backstop that can take at least 2x what you'll normally throw at it.
Anything's feasable...just takes some engineering.