The .12 Cooper (AKA: .12 Cooper CCM, .12 Eichelberger CCM, .12-22 Cooper CCM, .12-22 Eichelberger CCM) is a Center Fire cartridge with a Bullet Diameter of 0.123 in” (3.12mm) that is primarily used in Rifles. The .12 Cooper originated in The United States in (UNKNOWN DATE). The .12 Cooper also has a case length of 1.106 in” (28.09mm) and an overall length of (UNKNOWN).
Additional Cartridge Designations: Wildcat Cartridge.
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