What is caliber meaning?

Caliber generally refers to the diameter of a bullet or the internal diameter of a firearm's barrel. It is measured in either millimeters or inches. For example, if a firearm has a caliber of .22, it means that the diameter of the bullet is 0.22 inches. The term "caliber" can also be used to describe the size or power of a weapon. For instance, a "high-caliber" firearm is one with a large diameter bullet and thus has a higher stopping power than a lower caliber firearm. Caliber also plays a significant role in hunting and shooting sports, as different size calibers perform differently in different situations.