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Nominal measurement - .729 inches/18.5 mm

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Q: What is the bore of a 12 gauge shotgun?
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What is a 12 gauge shotgun?

A shotgun with a 12 gauge bore. Gun gauge is an old traditional measurement derived from the number of balls of the size to fit the gun that can be made from one pound of lead. A 12 gauge shotgun will have a bore of .729 inch (18.53 mm).


What is the difference between a 410 and a 12 gauge shotgun?

Size of the bore. 12 gauge is bigger.


What is a 12 gauge?

A shotgun with a 12 gauge bore. Gun gauge is an old traditional measurement derived from the number of balls of the size to fit the gun that can be made from one pound of lead. A 12 gauge shotgun will have a bore of .729 inch (18.53 mm).


What is a 410 shot gun?

This is a shotgun with an internal barrel diameter (called the "bore) of approximately .410" which shoots a shell which is about .410" in diameter. It is the only shotgun shell size that uses this convention. A 12 gauge shotgun, for example, does not have a bore of "12". A 20 gauge shotgun has a smaller bore than a 12 gauge and a 10 gauge has a bigger bore than a 12. Gauge size is based on the number of lead balls of the bore diameter which are required to make a pound (16 ounces). 10 balls, 12 balls, or 20 balls.


What is the difference between a 12 gauge shotgun and a 20 gauge?

Size of bore, size of ammuntion


Where does shotgun gauge come from?

Think of a lead ball which is the diameter of the inside of the barrel of the shotgun. The gauge of the shotgun is the number of balls that size to make up one pound. 12 balls - 12 gauge 20 balls - 20 gauge 28 balls - 28 gauge Exception - .410 bore is the actual bore diameter


What does 12 gauge stand for in a 12 gauge shotgun?

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.


Is a 8 gauge more than a 12 shotgun?

Yes, it is larger, the smaller the gauge the larger the bore i.e. 3 gauge is larger in diameter than a 8 gauge or a 12 gauge.


What does gauge mean in guns?

Refers to shotgun bore size. Specifically, it refers to the number of lead balls of that bore size that it takes to make one pound. A twenty gauge takes 20 balls to the pound where a 12 gauge takes 12 balls.


What is the difference between a twelve gauge and twenty gauge shotgun?

Size of the bore.


What does gauge mean in reference to a rifle?

Nothing. Gauge refers to shotgun bore


What is 30 bore cal?

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.