A TRUE 12mm cartridge would be the .480 Ruger, or .475 Linebaugh. However, I have seen both the .45 ACP and the .50 Browning called 12mm (they are 11.45mm and 12.7mm)
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There are 100 cm in a meter. There are 1000 mm in a meter. So 1 mm is .1 cm. 12 mm would 12 times more or 1.2 cm.
12 mm. 12 mm.
12 cm. There are 10 mm in 1 cm.
1 inch = 25.4 mm 1 ft = 12 in = (12 x 25.4) mm 950 mm = [ 950 / (12 x 25.4) ] = 3.117 ft (rounded)
The "mm" is the abbreviation for millimeters. So "12 mm" stands for "12 millimeters"