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Rimfire cartridges are limited to low chamber pressures because the case must be thin enough to allow the firing pin to crush the rim and ignite the primer. Rimfire cartridges of up to .58 caliber were once common when black powder was used as a propellant. Modern rimfire cartridges use smokeless powder, which generates much higher pressures and tend to be of .22 caliber (5.6 mm) or smaller in diameter. This also means that rimfire firearms can be very

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