What does the acronym 'CAL' generally refer to in the context of firearms?

In the context of firearms, the acronym 'CAL' is commonly understood to represent the caliber of the bullet. Caliber refers to the diameter of the interior of a gun barrel, and consequently, it aids in determining the size and type of ammunition that can be used with a specific firearm. This measurement is essential for identifying compatibility with various bullets and is a critical aspect of firearms training and operation.

Understanding caliber is vital for handling firearms safely and effectively, as using the wrong caliber can lead to malfunctions or dangerous situations. Knowledge of caliber assists in selecting the appropriate ammunition for different shooting applications, whether for target practice, competitive shooting, or hunting.