Quietest target I have found

My range is limited to 48 yards

Anything Metal is loud, Even wood is Loud, Even that hard rubber stuff that is hard to cut is loud.

So the winner so far is a card board box stuffed with old clothes , Then after its shot many many times wrap it with duck tape and start shooting again, Works pretty good if you want you can recycle and start over with a new box but lead will fall everywhere. Oh I like shooting the visible impact targets , And I got old rail road ties that I set my targets on, Hay bails might work, Just a thought. 

Mike
 
I also use a cardboard box, but it's stuffed with junk catalogs that are never-ending in the mail almost daily. The box is a 12-bottle container of my favorite beer, so there is a perpetual supply of both the box and it's stuffing. And yes, a fresh layer of good duct tape will greatly lengthen the life of the target box. I expect the cloth filling is quieter than the paper catalogs, but I find it acceptable, and I have close neighbors. I was asking one neighbor about it, and he said he could hear the pellet strikes, but not the rifle, and did not recognize it as any type of shot. 
 
+1 for duct seal... 1.25" slab in a cardboard box (with as many junk mail and/or flattened cardboards behind it for backstop). Works well on the quiet side of things. So far between .177 and .22 (18gr) @ 10yds, has yet seen any of those pellets penetrate through the 1.25". (Perhaps may penetrate at further distances as still a lot of energy in those pellets at 10yds)
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You've never tried a foam, archery target I take it..? I've got about an 18" cube that I put paper targets on a.

Plenty, or even "very" quiet. Fill the front with pellets, turn it around. Fill that with pellets, just cut the first 3-1/2" of the face off, and have a fresh new surface. I'm still working on the original faces after a little over a year, but it's getting close to having to trim the first "face" off.



Mike
 
I use 3/4 inch pine boards to make a wooden box that fix standard printed paper targets. On the very back is almost an inch of duct seal and then 4-5 inches of old clothe. Very quiet and very easy to replace the paper target, the loudest part is the pellet hitting that printer paper. As lead build up it made the box a little heavy but still works great.