To make matters worse, only shotguns are measured by gauge. Other guns are measured by the diameter of the bore. EXCEPT, the smallest shotgun you can get is the .410. It’s measured by bore width just like all other guns. So, you can get shotguns in 10 gauge, 12, 16, 20, 28 and .410. Someone just decided to measure one differently. It’s silly.
Edit to add, handguns and rifles are measured in bore size, which is equally fucked up because some are in millimeters, like the 9mm and the 7mm and the 5.56, but some are in inches like the .22, the .38 and the .45. Come on! Standardize that shit!
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