Drop in gauges can be very deceiving in regard to wall thickness at strategic points along the length of the barrels. The only good way to ascertain the wall thickness is with a gauge that can be put into the barrels far enough to measure their entire length from both muzzle and breech.
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“Every day I wonder how many things I am dead wrong about.”
― Jim Harrison
"'I promise you,' he said, 'on my word of honor, I won't die on the opening of the bird season.'" -- Robert Ruark (from The Old Man and the Boy)
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