I have conceal carried 9mm, 357, 40, 44, 45...
I don't choose my cc gun by caliber, but by the gun itself and where I am going. At work I don't want to print, so I carry something that won't. That can be anything up to a full sized 45 acp. In public I don't worry so much about my gun printing. I have successfully concealed an 8-inch revolver on occasion (shoulder holstered)...