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. What does .30 caliber mean?
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Caliber is the diameter of the bullet expressed in decimal parts of an inch, or in millimeters. 30 caliber is 0.308 inches diameter. 50 caliber is 0.50 inches or 1/2 inch diameter. For every cartridge there is a story about how it came to be and what it is capable of. Do you have specific questions about any cartridges?