6 mm/223

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The 6x45mm cartridge is the .223 or 5.56x45mm NATO round necked up to 6 mm. It is a fine small game or varmint round. It can be used in small bolt action or AR-15 type rifles. It was also tested by the US Army for a Squad Automatic Weapon. All this information is in #7 cartridges of the world By Frank Barnes. Also in the Sierra reloading manual.

The 6x45mm has a rather small powder capacity and will thus give best results using bullets of low to moderate weight (up to approx. 90 grains). Initial velocities are normally between 750 m/s and 850 m/s depending on bullet weight. Due to the low velocity and moderate effect on the game, it is a rather popular wildcat cartridge for small game hunting for meat.