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.223 Wylde is a hybrid rifle chamber designed to allow .22 caliber barrels to safely fire both .223 Remington and 5.56×45mm NATO ammunition. While the cartridge dimensions of both rounds are the same, 5.56 NATO loads produce pressures in excess of the .223 Remington specifications. The 5.56 chamber has angular differences that allow higher pressures, so .223 Remington can be fired from a 5.56 chamber safely, but with reduced accuracy. The Wylde design allows both calibers to be safely fired with good accuracy.