The .12 WMR (AKA: .12 Eichelberger Winchester Rimfire Magnum, .12 Eichelberger WRM, .12-22 WRM, .12-22 Eichelberger WRM, .12 Eichelberger Win Mag RF) is a Rimfire cartridge with a Bullet Diameter of 0.123 in” (3.12mm) that is primarily used in Rifles. The .12 WMR originated in The United States in (UNKNOWN DATE). The .12 WMR also has a case length of 1.064 in” (27.03mm) and an overall length of (UNKNOWN).
Additional Cartridge Designations: Wildcat Cartridge.
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