What is 12-gauge? - Quora

Answer (1 of 4): 12 gauge is a shotgun bore size . Bore refers to the number of round lead balls which exactly fit the bore which can be made from a pound of pure lead. 12 gauge ( nominal 0.73 caliber) means 12 balls to the pound, 16 gauge ( nominal 0.66 caliber) is 16 balls to the pound , 20g (

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