Great Backstop Material

You can buy Plastilina from Amazon a bit cheaper that what you said. They make a semi-opaque, light milky-white version, but I've been unable to find it recently (must be due to the EPA?). 

You can also make your own silly slime from sodium tetraborate (ultra-refined borax), water, and sugar. If you mix it thick enough, it will stand up on it own, sort of like a chunk of jello. Of course, if you want the best stuff, you can buy a large chunk of reusable ballistic gel from Amazon, for about $70. 

What must you do to renew it after many rounds? Remelt and the pellets are at the bottom? Cut em out one by one and remelt? Other?

I keep meaning to make a lead collecting trap - regular all metal- but currently just shoot.
The one place I lived where I needed a trap, ( for a 9mm Fire 201 ) to make sure everything stayed on my property and stay legal I decided to shoot at my House ( trap leaned against the middle of House ) which the local PD said should certainly meet the letter and intent of the law and my neighbors would "be alright".
I used a burlap bag STUFFED with used shrink wrap off shipping pallets. This material has one fatal flaw in that if you shoot the same spot too much is does work through. So every so many shots with the 9mm you needed to place the sack on the ground and step on it mushing the plastic back around, or fluffed ish.
I had fun testing with it. A burlap bag - easy to carry- stuffed so it maintains a 6" depth laying flat will stop, a 200fpe 9mm , a 16" crosbow bolt fired from a 175lb unit with NO damage to the bolt and a two finger5 pull out, 22rf. ... Not practical if you shoot a lot but surved it's low budget purpose.

Want to hear more about thte product you are using.


John

Rubber mulch works great and is quiet

"Centercut"Rubber mulch works great and is quiet

Click to expand...

+1 Rubber mulch in a cardboard is awesome. When the box wears out just pour the rubber mulch in to a new box. Easy peasy....

Rubber mulch is the best. Stops my 25 cal all day long. And when the box is too ragged, just pour it into another box. I even have a nifty way to get the pellets out. Just dump the mulch a little at a time into a Homer bucket half full of water. the pellets fall to the bottom.

Crusher

When i started with PCP's, january 2010, anything i read was about Duct Seal. Well i built a box and got my duct seal at Lowes or Home Depot, they still have it you find it in the electrical area. My box is made from scraps of 51/4 decking boards i had left over from a decking project. I also had some copper from a roll i had for flashing. I lined the back of the box with copper, and then 3 thicknesses of duct seal. I've used this box for 8 years, takes a hand cart to move it, which i've only done once or twice.

About a month ago i decided to take the lead out of the seal. put on rubber gloves and even tho i use a lot of red dot targets, so it spreads the impact area out, over time the lead basically made lead balls the size of marbles. I removed all of the duct seal and the lead, then reused the seal, went back in place without issue. I have the bottom row sitting on the small shelf the width and depth of the box. This box is 20 yards from my shooting position in the basement.

This picture is prior to removing the seal it is now is as deep as the bottom shelf. The copper behind the duct seal had no marks in it. Shooting 177, 22 and 25 Marauders

I just shoot into a straw bale. They are cheap, silent, easy to move around, and when you throw them away in the garbage bin all the lead goes with it.

This one works great for me ... I use double for high power air rifles. It was taken about 2000 shots and still good ... cheap and we can get it anytime at local store as Home Depot https://www.homedepot.com/p/Envirotile-24-in-x-24-in-XL-Brick-Black-Paver-MT5001194/205744208?MERCH=REC-_-mobileweb_pip_rr-_-203061059-_-205744208-_-N

Here's a video I did recently of my economy storage box and junk mail backstop. Stops my Trail .,25 mags at a couple yards distance when chronograph testing.
https://www.youtube.com/watch?v=tb5tkEEISZ0

Unionrdr........................... That was a scientifically approach to a somewhat geeky theme I must say. Interesting nevertheless.

I used a few of the inserts from used bullet proof vests.If you know any police officers they usually have a few old ones laying around. Just remove the inserts from the carriers
​stack them in the back of your target board. They work like a champ and the cost is great.