Véloce shotgun in 2018, Greens' David Shoebridge and anti-gun groups such as Gun Control Australia caused a moral panic on the mainstream media, calling it "semi-semi-automatic" that needed to be prohibited as a "rapid-fire weapon". Gauge The gauge number is determined by the weight, in fractions of a pound, of a solid sphere of lead with a diameter equal to the inside diameter of the barrel. So, a 10-gauge shotgun nominally should have an inside diameter equal to that of a sphere made from one-tenth of a pound of lead. Each gauge has a set caliber. By far the most common gauges are 12 (0.729 in, 18.5 mm diameter) and 20 (0.614 in, 15.6 mm), although 67 (.410 in diameter), 32, 28, 24, 16, and 10 (19.7 mm) gauge also exist. Different gauges have different typical applications. 12-gauge shotguns are common for hunting geese, large ducks, or other big larger gamebirds; professional skeet and trap shooting; military applications; and home-defense applications. 16-gauge shotguns were once common for hunters who wanted to use only a single shotgun for gamebirds normally pursued with 12 or 20-gauge shotguns, but have become rarer in recent years. 20-gauge shotguns are often used for gamebirds such as doves, smaller ducks, and quail. 28-gauge shotguns are not as common, but are classic quail-hunting guns. .410 gauge shotguns are typically used for squirrel hunting or for sportsmen seeking the challenge of killing game with a smaller load. Other, less common shotgun cartridges have their own unique uses. Ammunition manufacturer CCI produces 9 mm (.355 in.) and several other popular pistol calibers up to .45 ACP as well as .22 (5.5 mm) for firing from handguns. These are commonly called snake shot cartridges. Larger gauges, up to 4 bore, too powerful to shoulder, have been built, but were generally affixed to small boats and referred to as punt guns. These were used for commercial waterfowl hunting, to kill large numbers of birds resting on the water. Handguns have also been produced that are capable of firing either .45 (Long) Colt or .410 shotgun shells from the same chamber; they are commonly known as "snake guns". Derringers such as the "Snake Slayer and Cowboy Defender" are popular among some outdoors-men in the South and Southwest regions of the United States. There are also some revolvers, such as the Taurus Judge and Smith & Wesson Governor, that are capable of shooting