The bore diameter of a 10-gauge shotgun is 0.775 inches (or approximately 19.7 millimeters). This measurement is based on the traditional gauge system, where the bore diameter corresponds to the diameter of a lead ball that weighs 1/10th of a pound. The 10-gauge shotgun is known for its larger bore size compared to more common gauges like the 12-gauge, making it suitable for heavy-duty applications such as waterfowl hunting or long-range shooting.
For comparison, the bore diameter of a 12-gauge shotgun is 0.729 inches (18.5 mm), which is slightly smaller than the 10-gauge. The larger bore of the 10-gauge allows it to handle heavier payloads and larger shot sizes, but it also results in increased recoil and weight, making it less common for everyday use.
If you're considering a 10-gauge shotgun, it's important to note that ammunition for this gauge is less readily available and often more expensive than for 12-gauge shotguns. However, its power and performance make it a favorite among specialized hunters and shooters