Caliber

Caliber generally refers to the internal diameter of a firearm's barrel, expressed in either inches or millimeters. It indicates the size of the bullet that can be fired from that barrel. For example, a .45 caliber pistol fires bullets that are approximately 0.45 inches in diameter. Understanding caliber helps determine the power, size, and appropriateness of a firearm for different tasks, such as target shooting or self-defense. It is a fundamental specification that influences the firearm’s performance, recoil, and the type of ammunition used.