In the late 19th and into the 20th century, the 10-gauge was in widespread use as an all-purpose shotgun for hunting ducks, upland birds, and small game, much as the 12-gauge is today. It had a 2 ...
Shotgun gauges are determined by the number of lead balls of a given diameter required to make one pound of that size ball. In other words 20 balls of 20-gauge diameter are needed to make one pound; ...