How the Guns are Proved
To prove a gun means to test it, and one of the ways that makers do this is to load the barrel with a charge heavy enough to break any but the very best; it is then sent to the firing-room, where it is laid in a groove on a rack with its muzzle pointed toward a sandbank.
Then the charge is exploded, and if the barrel is without a flaw it will come out unscathed. It is then taken into another room, washed out and carefully inspected, and if it is O. K., it is next subjected to a water pressure of 600 pounds to the square inch, and if there is the slightest defect in the barrel it will burst. These tests are called the provisional proof.
After these tests are made each barrel is drilled to the required caliber and rifled, or it is bored to the proper gauge, depending on whether it is a rifle or a shotgun, and it is then fixed to the breech action. It is ready now for the final test, which is called the definitive proof, that is, the gun is loaded and fired again.
In this proof if the action shows any weakness it either gapes at the breech or else it is blown to pieces. After these tests when the gun reaches you may be sure that it is as nearly 100 per cent proof against exploding as it is possible to make it. In the old-time guns the different parts of the receiver and other parts were brazed together while now they are made of the finest quality of dropforged tool steel.
Collins, A. Frederick. Shooting, for Boys,. New York: Moffat, Yard and, 1917. Print.
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