In order of biggest to smallest - 8, 10, 12, 20 bore, then .410 as the smallest. The 410 is .410 inches. Do not know the mathematical relationship between gauge and barrel diameter.
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The relationship is INVERSE- the smaller the number, the bigger the bore. The gauge of a gun barrel is the number of lead balls that fit the barrel that weigh 1 pound. So 12 lead balls that fit a 12 g weigh one pound, 20 lead balls that fit a 20 g weigh 1 pound, etc. .410 is actually a caliber, not a gauge- if converted to gauge would be about 69 gauge.
I believe you are referring to a .410 (pronounced four ten) shotgun. This is a shotgun chambered in .410 caliber, which is different from other shotguns that are measured in gauge.
Chokes for shotguns shrink the bore's diameter to tighten the shot pattern and increase practical range.
Yes, they made 242,487 shotguns between 1869 & 1942.
Shotgun shells
draw for shotguns
A 12-gauge shotgun refers to the diameter of the shotgun bore, with the gauge system indicating the number of lead balls of the bore's diameter that would weigh one pound. In a 12-gauge, it takes 12 lead balls of the same diameter to equal one pound. The bore diameter of a 12-gauge shotgun is approximately 0.729 inches (18.5 mm). This gauge is one of the most popular sizes for shotguns, commonly used for hunting and sport shooting.
The AA-12 shotgun( Auto Assualt twelve) and the Mosberg shotgun.
A shotgun with a 40 mm bore would correspond to a 10-gauge shotgun. The gauge system is inversely related to the diameter of the bore; thus, a 10-gauge shotgun has a bore diameter of approximately 0.775 inches (19.7 mm), while a 40 mm bore exceeds the common shotgun gauges. However, 40 mm is typically associated with larger caliber weapons rather than standard shotguns.
Medieval Japan didn't have shotguns.
5 in a semi automatic shotgun, no limit on pump shotguns
In order to determine the age of Lefever shotgun, the serial number must be known. However, Lefever shotguns were only made and distributed between 1885-1916.
18" for shotguns