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Shotgun barrel wall thickness gauge12/31/2022 014 thickness whereas before I thought there was about. Without going into detail, I purchased Galazan's wall thickness gauge and began measuring my barrels. Additionally, increased pressure is a result of the longer cases not opening fully in the shorter chamber (torn case ends are commonly observed in such cases). For many years I measured the ID and OD, subtracted and divided by two to get the wall thickness thinking this is close enough. 2 1/2″ stamped guns are not tested for loads commonly found in 2 3/4″ cases. For this reason, it is important to use only cartridges with the appropriate length cases in guns stamped accordingly. The size (or length) of the chamber of a British gun was used to define the power of the cartridge used in it. Gun buyers are advised to pay close attention to wall thickness before buying a gun, as it will determine the likely life left in the barrels and therefore, affects value to a significant degree. A gun may be legally sold with any wall thickness as long as the bore measurement, taken 9″ from the breech, is within the above mentioned tolerances. Note that wall thickness, which is arguably more important in assessing the strength and serviceability of a gun barrel, is not a legally recognised proof issue. Metric stamped guns go out of proof once they are 8mm larger than last stamped. The 1984 -1989 rules metricated the stampings and the closest equivalent is shown on the right. If the current bore size is within ten thousandths of an inch (10 thou’) of the last size stamped, it is still in proof. The stamps on British guns showing the original bore size are very important factors in determining whether the gun is still in proof.
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