The most comprehensive and frequently updated resource of all calibers past and present is SAAMI (Sporting Arms and Ammunition Manufacturers' Institute), considered a standard reference for all things ammunition. Bullet Caliber, How Do They Name These Things?” To top it all off, most of the different 9mm caliber rounds aren’t even exactly 9 millimeters in diameter, since rounding up or down is pretty common. There’s a lot of history to ammunition naming conventions that we’re not going to get into here, but for a more in-depth look, read “ Bullet Sizes vs. Many of those go by anywhere from two to four different official names, not counting the nicknames you’ll hear bandied about. There are at least 18 different cartridges that use a 9mm bullet. Take a few calming breaths, we’re going to provide you with the many different 9mm ammo types explained in a way that’s as easy to understand as possible. “Can I use 9mm Luger if I own a new Glock and not some old WWII gun?' the print on a box of 9mm ammo, self-doubt sets in. Once someone is looking at the caliber stamping on a gun vs. You see, 9mm is a common blanket term that’s usually referring to one caliber of 9mm cartridge, not necessarily the 9mm bullet size. The truth is, it’s a more complicated question than it seems to be. Maybe the relative anonymity of the internet is why you don’t hear it very often at the gun shops, shooting ranges, hunting camps, and gun shows where firearm folks congregate. They may not have asked it out loud, though, since this is a frequent online search question. “Do all 9mm bullets fit 9mm guns?” This is a question that pretty much every gun owner, from first-timers to aficionados, has probably asked themselves at some point in their lives.

9mm rifle ammo