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Quite box bullet trap
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You can make a cheap bullet trap with a Home Depot 5 gallon bucket and rubber mulch. It will stop small calibers and give you something safe to shoot at. As far as reducing noise I’ve just used an FTN and subsonic ammo. Not perfect but it helps. Let me know if you come up with anything interesting.
In addition to this, hanging some old blankets surrounding your test area may be of marginal help, the thicker the better.