North Carolina Basic Law Enforcement Training (BLET) State Practice Exam

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How is the caliber of a bullet designated?

By its weight
By the length of the casing
By the diameter
By the type of gun it fits

The correct answer is: By the diameter

The caliber of a bullet is designated by its diameter. This measurement is typically expressed in either inches or millimeters, depending on the grading system used for the ammunition. Caliber refers to the inner diameter of the firearm's barrel, which corresponds to the same diameter of the bullet that it fires. For example, a bullet with a caliber of .45 means the bullet has a diameter of .45 inches, while a 9mm bullet has a diameter of 9 millimeters. Other factors related to ammunition, like its weight or the length of the casing, influence performance and application but do not define the caliber itself. The type of gun that a bullet fits may vary, as different guns can be designed for a range of calibers, but does not serve as a designation of caliber. Hence, the designation of caliber is predominantly associated with the measurement of diameter.