Never worked for me. There is .050" in one rotation of the barrel. About 7.2 degrees for every .001". You could probably hit correct head space in about .003" - .004". So lets say there is a 25 degree window of getting it right. That leaves 335 degree window of getting it wrong. 1 in 13 or 14 chance. I am pulling that out of the dark place.....
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