CHAMBERS FOR THE 223 and 5 - Welcome - South Texas ...

To increase velocity with a 55gr bullet, the U.S. Military bumped the .222 Rem's case capacity by pushing forward the shoulder and shortening the neck. This military modification of the .222 Remington was originally called the .222 Special but was later renamed the .223 Remington. In military metric nomenclature, the round is called the 5.56x45. ................
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