Related Cartridges
P.O. Ackley created an improved version of this cartridge called the .223 Ackley Improved. It has the straight sides and steep shoulder typical of the Ackley design improvements, yielding about 5% extra case volume. This in turn provides longer case life, less stretching, and up to 100 ft/s (30 m/s) faster velocities.
Wildcat cartridge developers have for a long time necked this cartridge up to create the 6mm/223 or 6×45. At one time this round was very popular for varminting and competition but has been replaced by current popular competition cartridges using short fat cases, such as the 6 mm PPC and the 6mm Norma BR.
The Thompson/Center Ugalde family of wildcat cartridges are also made by necking up .223 Remington cases, for use in the Thompson/Center Contender target pistol.
Read more about this topic: .223 Remington
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