I did a bunch of testing with a sound meter at varying distances to my pellet trap. The trap is filled with rubber mulch. I tried a cardboard box filled with rags instead and it was not quieter. I tried getting rid of the cardboard and that did not help either. Just the pellet hitting the paper was about 85 db. If you shoot a block of foam it is quiet but if you put a paper target on it you go right back up to mid 80s. I then tried putting sound deadening material around the target. I found I could make the target about 6 db quieter by putting a frame around the trap and then fastening towels to the frame to enclose all but the face of the trap. I had the towels out a foot or more in front of the trap. I don't keep doing it because my neighbors are not complaining and it's easier to just shoot into the pellet trap without the enclosure. There are undoubtedly things other than towels you could use. I tried ceiling tiles and they did not work well. But I did not try the kind of foam they sell to deaden walls. It should help.
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