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Someone (forgotten who) described taking a small machinist's rule (squared end forward) and inserting it into the chamber, touching the chamber wall, with good light coming from the muzzle end. When the rule begins to enter the forcing cone, the side of the rule will begin to separate from the chamber wall. When it does, look at the measurement on the rule. Bingo!
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"Striving to become the man my dog thinks I am"
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