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Wyop,
Use a dial indicator with a dimension stop. That way you get a "maximum runout" measurement, no matter how violent the wobble.
Also, the closer you get to centers the the less the wobble will be (stabilized) if the bore is concentric. If the wobble is at the ends near the centers, then you have an off axis bore.
Jimro
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Machine guns are awesome until you have to carry one.
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