Sorry, I don't yet have an answer to that question - though you may want to try me on mobile
where I can do far more
What is the difference between In guns including firearms, caliber or calibre, the approximate internal diameter of the barrel and by the extension of the projectile used in it. In a rifled barrel, the distance is measured between opposing lands or grooves; groove measurements and The millimetre (American spelling: millimeter; SI unit symbol mm; informal abbreviation: mil), the unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length?
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