What is the gauge size of a shotgun with the largest bore?

The gauge size of a shotgun is determined by the number of lead balls of a specific diameter that it takes to equal one pound. The larger the gauge number, the smaller the bore size. In this case, the 10 gauge has the largest bore, which means it has a wider diameter than the other gauge sizes listed.

A 10 gauge shotgun has a greater amount of internal volume, allowing it to use heavier loads compared to the 12, 16, and 20 gauges. The 10 gauge is often favored for specific hunting applications such as waterfowl hunting due to its ability to shoot larger shot sizes and deliver more energy to the target at greater distances. This makes it particularly effective for larger game. Therefore, it is correct that the 10 gauge is the shotgun with the largest bore size among the options provided.