2017年11月1日 — Therefore, multiply a bullet or bore caliber given in inches by 25.4 in order to convert it to millimeters. The opposite is also true: divide a...
For example, a "9 mm pistol" has a barrel diameter of about 9 millimeters. Since metric and US customary units do not convert evenly at this scale, metric...
An American 8 inch caliber howitzer would equal 203.19mm. Metric Measurement, English/US Inch Measurement. 5.40 mm .213. 5.50 mm .217. 5.56 mm .225. 6.00 mm .
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