A "10-gauge" refers to a specific size of wire or shotgun shell. In the context of wire, it indicates a thickness of approximately 2.588 millimeters. Thicker wires, like 10-gauge, are often used in electrical applications where higher current capacity is needed. In terms of shotgun shells, a 10-gauge shell is larger than most common sizes, such as 12-gauge or 20-gauge. It is typically used for hunting larger game due to its increased power and shot capacity. The 10-gauge is less common for recreational shooting but is favored for specific hunting scenarios.