Tipping an arrow with a spent .38 cartridge is an old trick. It’s a cheap way to blunt your arrows for hunting small game. Some even put nails through the cartridge after it’s glued to the arrow to keep the arrow from burrowing when stump shooting.
Not long ago I broke a judo off my stumping arrow and was lucky enough to capture it in slow-motion:
I decided to use this as an opportunity to try the .38 blunt tip. As you can see in the video below, it could have worked out much better:
I believe if I would have tapered my arrow before mounting the tip to give the glue more of a bonding surface there would have been a higher chance of the tip staying on. The thicker glue coverage might have also given the shaft more of a “cushion” in the metal shell to vibrate and disperse energy that otherwise contributed to the tip snapping. Live and learn!