Being a new collector I decided to start with a cartridge that the Luger was originally designed for, .30 Luger. Also, as
rhuff stated, the 1920 commercials are found at lesser prices due to greater supply and less desire for them I guess. Anyway, I found what I was looking for and am really liking it- shooting the .30 Luger is great, and my wife even enjoys shooting it! I subsequently got a 9mm shooter and like it also, but not as much as the .30 Luger.
KW