ABOUT .72 caliber. I say about because the degree of choke on a shotgun changes the muzzle diameter.
the 12 guage is a caliber not a gun
The term 12 gauge is used to describe the caliber(bore diameter)of your shotgun.A 12 gauge barrel is 72 caliber,but the word gauge is used so people can determine you are talking about a shotgun,instead of a rifle.
Yes. The Mossberg 500A1 is a .12 gauge shotgun.
It's difficult to answer the question because gauge and caliber are two different things, and different shotgun shells have different types and numbers of projectiles.
.61 Caliber is the same as 20 gauge. Rifles are generally measured in caliber which is expressed as bore diameter. A .44 magnum means a .44 inch bore; similarly countries with the metric system use metric bore measurements (ie. 9mm Luger) Shotgun measurements are expressed in gauges. Gauge measurements are fractions of a 1 pound ball of lead. A one gauge shotgun shoots a one pound ball of lead. A 12 gauge takes 12 round lead balls to equal a pound and a 10 gauge equals a tenth of a pound. The smaller the gauge; the larger the bore. The only shotgun I am aware of that is measured differently is the .410 shotgun which is approximately .45 caliber or a 67.62 gauge.
Impossible to answer without a detailed description of ALL markings, caliber/gauge, barrel length, sights, stock, etc
Caliber is the measure of th internal diameter of the barrel in inches- a .30 caliber gun fires a bullet that is about 30/100ths of an inch across. European guns are usually measured in millimeters- a 9mm fires a 9mm diameter bullet. Bigger number equals bigger bullet. GAUGE is an older term used to measure the internal diameter of a shotgun barrel. It came from the number of round lead balls that fit the barrel that add up to one pound. So 20 balls in 20 gauge weigh one pond, 12 balls in 12 g weigh one pound, etc. SMALLER the gauge, bigger the barrel. The .410 shotgun is the exception- that is really .410 caliber.
Shotguns are described by gauge, not caliber. It should be marked on the barrels as to which is the correct ammuntion and gauge. Shotguns are described by gauge, not caliber. It should be marked on the barrels as to which is the correct ammuntion and gauge.
gauge
12 gauge equals 0.0808 inches or 2.0525 millimetres, if using the American wire gauge (AWG) scale.
No serial number equals no way to answer
I suppose you mean: What is a 30 caliber bore? The bore of a Rifle is referred to as the caliber, which equates to the diameter of the bullet it fired. A gun that shoots a 9mm bullet would be a 9mm caliber or the bore size. Most guns originally made in US were measured in INCHES. Thus a 22 caliber rifle was a gun that shot a 0.22 inch diameter bore. Since the US Army began to change over to the metric system, it began making guns to the 9mm and 7.62mm sizes. Some bores can have alternate names. A new pistol bullet is the 0.40 INCH caliber designed by Smith&Wesson is also referred to as the 10mm caliber. The bore size of Shotguns are measured using Gauge. For example, shotguns are referred to as 12-Gauge or 20-Gauge. Gauge is an unusual measurement. The gauge equates to the number of lead balls that are made to the diameter of shotgun's bore and totals a weight of 1 pound. Thus, a 12-gauge shotgun has a diameter that of a ball that would weight 1/12 of a pound. That means the Larger the bore of the shotgun, the smaller the gage number. A 12-gauge shotgun is bigger bore than a 20-gauge shotgun.