This post inspired me to give it a try. Being impatient, and not wanting to wait for a bullet mold, I tried a slightly different method. I have some 7/16 diameter hot glue sticks, which I cut into 3/8" lengths with a razor. I then tap an unprimed 38 Special case into the end with a rubber mallet. This cuts the projectile to the inside diameter of the case and at the same time seats it flush with the case mouth like a wadcutter. Then I prime. I have only Tula standard SPP, but they seem to work fine. I didn't drill out the flash hole, so I'll be able to use these cases for regular loads later. They'll punch through the front and lodge in the back of an empty soda can, and don't seem to do anything to the top of a hardboard table I have as a backstop.
One thing that's causing problems, though, is that the struck primers wind up protruding very slightly, which causes my Ruger Service Six to seize up. These same primers weren't causing any problems with regular handloads in the same gun. Any thoughts as to what is causing this, and what I can do to fix it?