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Sorry, put me in with the do-not-believe crowd.
The Rifling would create weaker points along which the twist runs due to the slightly lower level of steel in those regions. This would be seen as a slightly twisted, or extremely cracked appearance if the tears did not go along the rifle lines. These tears are perfectly straight.
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"Smite the rocks with the rod of knowledge, and fountains of unstinted wealth will gush forth." - Ashbel Smith as he laid the first cornerstone of the University of Texas
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