Testing a Damascus Shotgun Barrel
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Testing a Damascus Shotgun Barrel

Testing a Damascus Shotgun Barrel




      

Testing a Damascus Shotgun Barrel


Testing a Damascus Shotgun Barrel

Each barrel, after manufacture, should be carefully tested, and submitted to the necessary proof. The diameter of the bore should be verified with the standard and limit gauges. The standard gauge is a cylinder of the diameter of the bore, and the limit gauge is .0025 inch greater. The former should pass freely through the bore, and the latter should not enter it. The barrel should enter the groove of the stock one-half of its diameter, and it should bear uniformly throughout, particularly at the breech. The vent should be accurate in its dimension, position and direction, and a wire should be passed through it to see that it is free. The cone should be sound. The shoulders of the breech-screw should fit closely to the end of the barrel, and it should be free from cracks or flaws about the tang-screw hole. The straightness of the barrel may be ascertained by turning out the breech-screw, and holding the barrel up to the light, and reflecting the image of a straight-edge from the surface of the bore. If the barrel be straight, the reflected image will be straight in all positions of the barrel. The bore must be free from all hammer marks, ring-bores, cinder-holes, flaws, cracks, etc., as such irregularities cause an inaccuracy of fire.

Farrow, Edward S. American Small Arms; a Veritable Encyclopedia of Knowledge for Sportsmen and Military Men. New York: Bradford, 1904. Print.

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