How did you make your Target backstop ?

Dude I took a cardboard box and cut up shreds of t-shirts and baby cloths. I shoot my 25 cal condor at 65 fpe at it every now and again and 177,22, and 20 cal pcps from 18fpe to 35 at it all the time. I sometimes pack more shredded shirts inside the holes and it has held up great. I highly recommend this method. Then I just put up some plywood just in case I miss but in over a year I've had no ricochet or need of the wood. 
 
My indoor trap is 3 layers of Duct Seal, each being maybe 2" thick.

Nothing gets through this. Even slugs out of the AEA Challenger 357 pushing well over 200 fpe barely make it through one layer of this stuff.

The only backstop Duct Seal needs is more Duct Seal. Zero ricochet, zero lead dust issues, this stuff is all you need. I would shoot powder handguns at it with full confidence as well.
 
Duct seal is awesome but if recasting I don't like it. That being said.


I need to get a angled trap so I can recast my slugs but I just use the mountains of fill when I go long. 
I've seen some ranges that are beautiful but I appreciate the visual splash I get to see with the fill.

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I bought my first fancy oak target box decades back and put three 5lb bricks of Duct Seal in it. Used it for many years then started shooting at 100fpe for a few sessions until the hardwood box cracked.



Then I just stacked six or seven bricks against the wall two thick so nothing is getting through them.



Like others have said the rubber mulch stuff werqs but it smells like rubber. Boxes with clothing scraps werqs also as does phone books and magazines but they get messy after awhile. I have heard about the archery targets but have not yet used one.


 
a good sized box filled with junk mail old mags and other paper and broke down small boxes etc makes an excellent pellet trap, it will stop just about any pellet imo as long as the box is filled flatly and evenly .. several full auto mag dumps from a blitz 22 and none even made it through ... doesnt last forever and im sure after several hundred rounds might start being less effective, pends what your doing i guess ...

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Wooden box with rubber mulch and a 10ga steel plate at the back just in case. Coroplast as a somewhat self-healing front cover. Rubber mulch is pretty good, but if you are tuning and shooting in the exact same spot from 6 feet away you can get some tunneling. With the steel plate at the back, no worries at pretty much any FPE and you can go thinner on the rubber mulch if desired. The fairly new indoor firearm shooting range near me has huge piles of rubber mulch as their only backstop. You can shoot any caliber up to 50BMG and any bullet type as long as it isn't a tracer (don't want a tire fire, haha).

I haven't tried the duct seal, but I can see the appeal if you wanted a design that didn't require a replaceable front cover like is required with rubber mulch.
 
I used 2x3's to make a frame to hold a 24 x 36 x 0.5 Marine Poly board at a 45 angle with a metal catch pan underneath. It has 2 removable shelves for plink boxes. Marine poly board is about the only thing short of metal that can withstand 50 ft/lbs, and it is also a lot quitter than steel. I've been dumping tin after tin of 22 19g @ 920 fps into it and I still haven't had to replace the poly board yet. Although it does look like a cheese grater, it has not gone through yet. The standard size 24x36 sheet slides in from the top of the stand when ever you need to replace it. I can insert almost anything up to 24 x 36 x 1. I even tried gluing a outdoor floor mat to it to deaden the sound some more but that only lasted for about 1 tin before it was shredded and falling off. It's portable, so I can move it anywhere. It's nice to be able to zero in from my kitchen table during the summer heat.
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When I got back into air guns about 7 years ago I bought a Do All Outdoors rimfire bullet trap. I quickly became tired and annoyed with the noise in my backyard setting. I tried various methods to make it quieter but it was never quite satisfactory for me. Air guns had changed and advanced so much in my absence that I found myself researching them heavily online and on YouTube. I eventually learned about rubber mulch pellet traps and got an idea to stuff my rimfire trap with rubber mulch. Couple of layers of cardboard taped over the front keeps it all inside. Works great and so much quieter than anything else I tried before. My most powerful air rifle is a .25 Mrod at 40 fpe so no problem. No worries about a pass through even if it started to channel. I suppose you could use duct seal but I didn’t like that idea because I thought I’d be a lot more messy than the mulch. 
The pellet striking the cardboard is still kind of loud especially with a .25 cal pellet and when the cardboard is fresh but it gets quieter as you shoot out the cardboard and you got nothing but layers of tape your shooting through. I’ve taken the time to cut out the center of the cardboard and just tape it up before shooting to speed up the process to where it’s as quiet as it can be from the start. I don’t know that I’d recommend buying a rimfire bullet trap just to make it a rubber mulch trap out of it but if you already have one and want to make it quieter a bag of rubber mulch is fairly inexpensive. I use blue painters tape because it doesn’t leave behind sticky adhesive residue like duct tape does. 

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