Which type of shotgun shell size is typically the largest available?

The 10 gauge shotgun shell is the largest size typically available. Shotgun gauges are determined by the number of lead balls that fit into a barrel, with the gauge number indicating the number of balls—each having a diameter equal to the bore—needed to weigh one pound. Lower gauge numbers signify larger diameters.

In this context, the 10 gauge shell has a wider diameter and a larger capacity for shot, which results in a heavier payload compared to the other gauges listed. This makes it suitable for hunting larger game where greater stopping power is needed, thus making it a popular choice among hunters looking for high performance in loaded shots. The other gauge sizes (20, 12, and 16) are smaller in diameter and designed for different types of hunting and shooting scenarios, providing various balances of recoil, shot size, and effectiveness.