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  1. Copilot 答案
    History

    The development of the cartridge, which eventually became the .223 Remington, was linked to the development of a new lightweight combat rifle. The cartridge and rifle were developed by Fairchild Industries, Remington Arms, … 展开

    Cartridge dimensions

    The .223 Remington has a 1.87 mL (28.8 gr H2O) cartridge case capacity.
    .223 Remington maximum CIP cartridge dimensions. All sizes in millimeters (mm).
    Americans would define the shoulder angle at alpha/2 = 23 d… 展开

    .223 Remington vs. 5.56×45mm NATO

    In 1980, the .223 Remington was transformed into a new cartridge and designated 5.56×45mm NATO (SS109 or M855).
    The external dimensional specifications of .223 Remington … 展开

    Effects of barrel length on velocity

    Barrel length helps determine a specific cartridge's muzzle velocity. A longer barrel typically yields a greater muzzle velocity, while a shorter barrel yields a lower one. The first AR-15 rifles used a barrel length of 20". In the case … 展开