Caliber is used to describe the size of a bore and the size of the cartridges designed for different bores
- Usually measured as the diameter of the bore from land to opposite land
- Expressed in hundredths of an inch, thousandths of an inch, or millimeters
- In some cases, the caliber is given as the diameter of the bullet, which is the distance between the grooves.
- Every firearm is designed for a specific Caliber
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