What is the difference between inches, millimeters and caliber when talking about guns?
In: Engineering
Caliber = the inside diameter of the gun barrel.
This can be stated in millimeters or inches. The millimeter calibers are easy to understand; 9mm means the inside barrel is 9mm in diameter and so on. If you see something like “45 caliber” this means a 0.45 inch inside barrel diameter.
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