It could be argued that the origin of the modern precision rifle cartridge was in the late 1970s when Dr. Louis Palmisano and Ferris Pindell created a cartridge and named it the 6 mm PPC. It was based on the .220 Russian cartridge. Palmisano and Pindell reduced the body taper of the case, gave it a 30-degree shoulder, and necked it up to 6 mm. It became very popular for benchrest competition, and some have gone so far as to claim it the most accurate centerfire rifle cartridge ever created.
About 45 years later, Hornady introduced the 6 mm ARC cartridge. The 6 mm PPC and the 6 mm ARC are dimensionally very similar. The primary difference is that Hornady specified a rifling twist
