It's a commercial trap.

by Paul , Sunday, September 28, 2025, 19:13 (8 days ago) @ JimT

Aaaahhh!!!! Nifty!

I've been using an apple box, stuffed with sheets of cardboard broad side on. So far I've not found anything that will penetrate it fully, not even 32ACP FMJ, not that I've shot that in the house, but did run a couple in it out at the gun range one time. A couple weeks ago I ran about 50 rounds or so of 30 caliber air rifle into it. It made a lovely cavity where they grouped, but penetration wasn't that deep. I just stuff shredded office paper into the cavity, apply a new sheet of cardboard to the face and keep on going. Those commercial traps are handy, don't have to sort much through the paper to recover the lead.