Thread: Building a test fire tube / bullet trap

My inner-city bullet trap was an old 45kg gas cylinder with a 20mm plate welded on the bottom, about 300mm of crushed gravel then filled to halfway with dry sand. I had a short steel tube in the top with heavy rubber sheet attached at each end with a 25mm hole. It sat on a frame that held it at 45 degrees and I got over 20 years of regular use out of it. I also had a 12mm steel scroll-shaped bullet trap that handled all rimfire and pistol calibres for 10 metre zeroing. Firing was done in enclosed shooting tunnel with an extractor fan for the fumes.