I'm setting up my grandpa's old Truline Junior press for 9mm Luger reloading. I have the press, dies, #55 powder measure, and priming post. All I need is the shell holder. I know I could use the J to X converter and modern shell holder with a T priming punch, but I'd like to find an original shell holder. Does anyone know the correct number for 9mm in these old shell holders? I think it's 12 from poking around on the internet.