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Posted by Jim S on Sunday, 24 July 2011, at 1:21 a.m., in response to Re: Tumbling, posted by Dick Hosmer on Sunday, 24 July 2011, at 12:39 a.m.
I'm using 30-1 I'm not a machineist either,& have not worked in a machine shop for 24 years. I talked to my gunsmith about this ( a GOOD one) he said with what he has he could only come close , not on the money. Some have measured odd barrels by wrapping a feeler gauge around & subtracting double the feeler gauge thickness.I don't feel that this would be accurate with a 3 groove with that much distance between high points where the feeler gauge may not follow the actual curvature & may also be easily & unnoticeably compressable. I wonder how well that would work on a .30 5 groove ?
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