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...
Caliber x 25.4 = size in mm (Example: .45 caliber x 25.4 = 11.43 so .45 caliber = 11.43mm). Metric designation / 25.4mm = size in Caliber (Example: 9mm...
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