The 3mm US is a Center Fire cartridge with a Bullet Diameter of 0.12 in” (3.05mm) that is primarily used in Pistols. The 3mm US originated in The United States in (UNKNOWN DATE). The 3mm US also has a case length of 1.85 in” (46.99mm) and an overall length of 2.16 in” (54.86mm).
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