Firearms by caliber

"Firearms by caliber" typically refers to the classification of firearms based on the caliber of ammunition they use. Caliber is the measurement of the internal diameter of a firearm's barrel, most commonly expressed in inches or millimeters. The caliber often influences the firearm's design, common applications, and performance characteristics. Here’s a brief overview of common calibers and their typical usage: ### Handgun Calibers - **.