RBHarter
West Central AR
How deep is too deep for grooves ?
I have a project in mind that might be just dumber than a bucket of rocks .
At one extreme we have micro groove with very shallow grooves , something like .005 . At the other end Ballard or like an SKS I had that was .316×.305 , so .011 . If we move up to the big guns or scale Micro groove up to 16" you can lay a tape measure on them .
I guess the question is , is there some ratio that gives a window or is it some ancient thumb rule like bore plus .007 or 1% ?
For my intention I would just lap an oversized groove up to the next cal . The barrel in question is a loss already so if it's ruined it's not a big deal . There's plenty for a rebore to something more useful but not to get to what I want . If I can keep most of the lands and add say .010 to the groove it seems like it should work . .248-.251/6/7 ........looks better as a pistol groove 25 cal from .243 than a rifle groove and that might serve me better anyway .
Time vs money ........
I have a project in mind that might be just dumber than a bucket of rocks .
At one extreme we have micro groove with very shallow grooves , something like .005 . At the other end Ballard or like an SKS I had that was .316×.305 , so .011 . If we move up to the big guns or scale Micro groove up to 16" you can lay a tape measure on them .
I guess the question is , is there some ratio that gives a window or is it some ancient thumb rule like bore plus .007 or 1% ?
For my intention I would just lap an oversized groove up to the next cal . The barrel in question is a loss already so if it's ruined it's not a big deal . There's plenty for a rebore to something more useful but not to get to what I want . If I can keep most of the lands and add say .010 to the groove it seems like it should work . .248-.251/6/7 ........looks better as a pistol groove 25 cal from .243 than a rifle groove and that might serve me better anyway .
Time vs money ........