As an expert in firearms and ammunition, I can tell you that the term "caliber" refers to the internal diameter of the barrel of a rifled firearm or the diameter of the bullet that is fired from it. The 9mm caliber is a common measurement used to describe the diameter of a type of ammunition, specifically for handguns and some submachine guns.

In the context of the 9mm, it is a unit of measure that is approximately equal to 0.355 inches (9.00 millimeters). It is important to note that caliber is a nominal measurement, which means that the actual bullet diameter can vary slightly from the nominal caliber. For instance, a 9mm bullet might actually measure 0.374 inches (9.5 millimeters) in diameter.

The 9mm is a versatile and popular caliber used in various types of firearms, known for its balance of power, accuracy, and manageable recoil. It is used by law enforcement, military, and civilian shooters alike.

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Pistol cartridgesNameBullet DiameterCase Length9mm Glisenti9.02 (.355)19.15 (.754)9��19mm Parabellum (9mm Luger)9.02 (.355)19.15 (.754).357 SIG9.02 (.355)21.97 (.865)9mm Browning Long9.09 (.358)20.20 (.795)17 more rowsread more >>