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222 SPECIAL

This was part of the development of the 223 Remington. Because of concerns over chamber pressures, Armalite redesigned the 222 Remington case to increase powder space, while keeping the OAL relatively unchanged. In order to avoid confusion with the 222 Remington and 222 Remington Magnum, Remington renamed the cartridge to 223 Remington in 1958.