Barrel terminology


CYA accuracy fool friends:


Here's some barrel terminologies I use as I discuss barrel bores and rifling patterns...


The bore diameter of a barrel is a measurement from one land top to the opposite land top...


The groove diameter of a barrel is a measurement from one groove to the opposite groove....



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Note:


The only diameter we can accurately measure is the groove diameter......this is done by using a micrometer on a slug pushed through the bore.


We can not accurately measure the bore diameter of a barrel........(land top to land top)


And no, I'm sorry, this can not accurately be done with gauge pins......nor reamer pilots.....


The bore diameter is not really needed anyway.........


Your friend, Bill pistol fool Calfee