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dahermit · October 7, 2011, 08:44 AM

Years ago, I think in the American Rifleman, was an article with a drawing of a miniature "v-block" that machinists could make to measure the odd number of grooves on a S&W fired bullet. There was a specific number that was subtracted from the measurement to give the correct diameter of the slug. I had made a drawing to enable me to make one, but never got around to it, and that was in the early 70's so I do not have it now. But, there may be some math wiz who reads this that can make a sketch and figure the angles to post it here.

I have added the device here, if some math person wants to add the correct angles, formula to construct it.

October 7, 2011, 08:44 AM	#2
dahermit Senior Member Join Date: October 28, 2006 Location: South Central Michigan...near Posts: 6,501	Years ago, I think in the American Rifleman, was an article with a drawing of a miniature "v-block" that machinists could make to measure the odd number of grooves on a S&W fired bullet. There was a specific number that was subtracted from the measurement to give the correct diameter of the slug. I had made a drawing to enable me to make one, but never got around to it, and that was in the early 70's so I do not have it now. But, there may be some math wiz who reads this that can make a sketch and figure the angles to post it here. I have added the device here, if some math person wants to add the correct angles, formula to construct it. Last edited by dahermit; October 7, 2011 at 02:29 PM.