Here's a way to make 9mm shotshells from 223 brass. These actually cycle the guy's Glock. I've never had any luck with the 9mm CCI factory shells functioning my pistols
https://youtu.be/lSZOArNqTdw?si=ok_vnvltTAk83-c4
9mm shotshells from 223 brass
9mm shotshells from 223 brass
"Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it." - Samuel Clemens (aka Mark Twain)