As far as I know, this is the appropriate sub-forum for my question. As far as the major (most popular) handgun calibers go, how easy is it to usually find each one, and what would you estimate is the percent of each in the total market (or production) of handgun cartridges? I'm 21 and am still doing research on what I want my first handgun to be, but I do know that I want it to be a Glock. I've narrowed it down to about four models, but want to know that my selected chambering is common and always available. The way I figure it, at least 50% of the total U.S. handgun market is .45 ACP and 9mm (together). So just considering the most prevalent calibers, how easy is each to find? I hear that many or most police departments are now using .40 S&W, so that's a point in its favor, but does that necessarily mean that I can always find it at Wal-Mart, Dick's Sporting Goods, or Gander Mountain? I think I want my Glock chambered in 9x19, .40 S&W, or .45 ACP. By the way, I don't consider .22 LR a handgun cartridge. Thanks in advance, and any information would be greatly appreciated.