The precision is 15 significant digits (fourteen digits to the right of the decimal point). Traditional standards for the exact length of an inch have varied in the past, but since the adoption of the international yard during the 1950s and 1960s it has been based on the metric system and defined as exactly 2.54 cm. Derived from the Roman uncia (twelfth), inch is also sometimes used to translate related units in other measurement systems, usually understood as deriving from the width of the human thumb. The inch (abbreviation: in or ″) is a unit of length in the imperial and United States customary systems of measurement now formally equal to 1⁄36 yard but usually understood as 1⁄12 of a foot.
The millimetre or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length. SKY 3-PCS Black on White Compatible TZe-221 9mm 0.35 Inch Laminated TZ Tape for Brother P Touch H110 D400 D210 Label Printers. This is how the units in this conversion are defined: Millimeters Common Handgun Calibers Converted to MM and Inches Handgun Cartridgeįortunately, understanding the conversions between metric and imperial for handgun calibers is quite a bit easier because there are far fewer common pistol cartridges than there are rifle cartridges.įor the most part, handgun calibers are either 9, 10, 11, or 12mm. 30 caliber cartridge, which isn’t actually correct at all.Īs you can see, the naming conventions of cartridges is complicated because ammo manufacturers like using clean, even numbers and to ignore the actual measurements.īecause the table above has to make some generalizations about particular cartridges, I’ve included the table below which lists each rifle cartridge separately so you can see the specific bullet diameter in inches and its exact metric conversion. The difference is that one measurement is the distance between the grooves (the cut out portions of the rifling in the barrel, and another measurement uses the measurement to the lands (the raised portion of the rifling). Converted to metric, that’s 7.82mm, but most people would refer to it as a 7.62 because of its military distinction. 308 Winchester is so named because the bullet is. That’s because the naming conventions for many of the most popular cartridges bend the rules of measuring in order to come up with a nice sounding name.įor example, the good old. There are some things in that table that just don’t seem right. If you’re like me, looking at the table above starts to make your head spin. The information available from our sources is usually.
If all else fails, you may want to use our Tap Drill Size Calculator. Because of differences in numbering systems, some conversions are approximated but are within. So, 9 mm 9 × 0.0393700787 0.354 in (this result may be approximate). This table is the chart for converting and identifying various drill bit sizes. Rifle Cartridge Caliber to Metric Conversion Table Rifle Caliber Name To convert from millimeters to inches, multiply the value in millimeters by 0.0393700787. The manufacturers of ammunition have done us no favors in making this easy to understand, but I’ve put together this handy resource so you can quickly see the equivalent naming conventions between mm and inches (caliber). Our Conversion Chart for Millimeters, Decimals and Fractions will assist you in determining the conversion between millimeters, decimals in inches and fractions in inches. This page will explain the problem as clearly as possible. Many shooters are confused because there are two different systems for measuring the bore diameter for a cartridge: (1) the caliber system measuring the diameter of the bore of the barrel in inches, and (2) the same measurement, but in millimeters.
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