Groove diameter .355"



AS A REFRESHER:


Here's the definition, right out of the NRA Firearms Sourcebook. It is “...the minor interior diameter of a barrel that is the diameter of a circle formed by the tops of the lands.” That is the bore diameter, but groove diameter is “...the diameter of a circle circumscribed by the bottom of the grooves...”

https://www.americanrifleman.org/articles/2011/3/15/terminology-bore-diametergroove-diameter/

Last edited by ready_on_the_right; 04/09/21.
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