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Re: Groove diameter

Posted by Wayne McLerran on Thursday, 14 August 2014, at 1:37 a.m., in response to Re: Groove diameter, posted by Wayne McLerran on Thursday, 14 August 2014, at 12:36 a.m.

OK guys, the bottom line is Dick Hosmer is correct and I need to man up and confess I screwed up big time. Posting that the land and grooves in my carbine are close but not the same width resulted in additional thoughts on the subject and subsequently researching my TD files. Ive have a couple of TDs and the chamber cast I grabbed to make the recent measurements were from a TD carbine that was relined some time ago by Bobby Hoyt. Bobby makes his own liners, cutting the lands and grooves himself. Hence the reasons the lands and grooves are close but not exact.

What I found in researching my files is I exchanged comments with Dick Hosmer on this forum around 4 years ago on the subject of measuring groove and bore diameters. At the time I measured slugs from the original carbine barrel and found that measuring across the edges of the lands was the same as the measurements using a v-anvil micrometer. So I stand corrected and apologize for unintentionally leading anyone astray.



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