The 32 gauge shotgun is a shotshell size named for the weight of a lead ball that would fit the (theoretical) bore of the gun. A one thirty-second pound lead ball has a diameter equal to the bore of a 32 gauge shotgun--in this case, .526 inches. This is one of the smallest gauges available, being larger than the .410 bore but smaller than other sizes such as the 12, 20, and 28 gauge. For the most part, the 32 gauge is more popular in Europe and Latin American than in the United States. It is an excellent choice for small upland birds and can be used for shooting clays if some challenge is desired.