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- The bore diameter of a rifle can be determined by measuring the depth of one groove at one of the groove-to-land transition steps and subtracting twice the amount from the groove diameter1. In the traditional Anglo-U.S. system, caliber is measured in inches for cannons and hundredths of an inch for small guns2. For example, the bore diameter of a .30-caliber rifle is 30/100 of an inch, and that of a .50-caliber weapon is 1/2 inch23.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.The bore or land diameter can be determined by measuring the depth of one groove at one of the groove-to-land transition steps and subtract twice the amount from the groove diameter.www.texas-mac.com/Measuring_Groove_Diameter…In the traditional Anglo-U.S. system, calibre (or caliber) is measured in inches for cannons and hundredths of an inch for small guns. Thus the bore diameter of a.30-calibre rifle is 30/100 of an inch, and that of a.50-calibre weapon is 1/2 inch.www.britannica.com/technology/bore-firearmsThe bore diameter of a.30-calibre rifle is 30/100 of an inch, and that of a.50-calibre weapon is 1/2 inch. The diameter of the smaller circle (measured from the tops of the lands) is the Bore Diameter. It is the largest round thing you could pass through the barrel, without having to miss-shape it to make it fit.defencedirecteducation.com/2019/03/25/what-is-bo…
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Measurement of bore and groove diameters - Firearms identification
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WebBore and groove diameters. Courtesy of Ronnie Freels. The bore diameter of the barrel of a rifled firearm is defined as the diameter of the circle formed by the tops of the lands inside the barrel. This diameter does not include …
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WebMar 15, 2011 · The greater (major) diameter is the groove; the lesser (minor) is the bore. Here's the definition, right out of the NRA Firearms Sourcebook. It is “...the minor interior diameter of a barrel ...
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