The oldest method of rifling is the single point or hook rifling method. With this method, a cutter is adjusted to make a cut of approximately .0005” depth and is then pulled through to create each groove in the barrel. After making the cut in each groove, the cutter is adjusted to cut .0005” deeper and then pulled through each groove again with the process repeated until the desired depth of the groove is obtained. With this method, the annular rings produced by the reaming are completely removed by cutting the groove, but left on the top of the land.
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