Groove diameter is a firearms term. According to gun writer Matthew Boyd, groove diameter is "the groove to groove diameter of the inside of a gun barrel. This is usually the same as the diameter of the bullets that it is intended to fire."
Bibliography - Further Reading
- Party, Boston T., Boston's Gun Bible. Wyoming American Redoubt Javelin Press, 2009 revision to 2002 edition
- Boyd, Matthew J., "Basic firearms Terminology Defined." Guns and Shooting Online - Chuck Hawks.com, 2012. Accessed February 19, 2015