Ballistic Technology's The Bullet Test Tube
This bullet-testing system uses cardboard tubes filled with a reusable plasticlike test medium. Fire a shot at the center of the tube, cut the cylinder in half, and you see exactly what size cavity your bullet created, its depth of penetration, and even the bullet itself. This is much more sophisticated than my old Ballistic Buffalo (layers of newspapers, inner tube, and plywood). To reuse, melt the stuff down, pour into a mold, let it cool, and you're ready to go again. The outfit is about $200. 304-425-8823; thebullettesttube.com --D.E.P.