A shooting buddy just gave me a can of old, odd, misc cartridges to look through for my collection. There were a few 9MM's formed from other cases. One was made from a 38 auto and one was made from a 38 special case. There were also a couple of 30 Luger cases made from a 38 special case and a 30-30 Winchester case. Very interesting. He said that they probably came from an old time gunsmith that was locally famous.