Background
The cartridge is a necked-up version of the .22 PPC which is in turn based on a .220 Russian. The standard bullet diameter for 6 mm caliber cartridges is .243 inches (6.2 mm), the same diameter used in the .243 Winchester and 6mm Remington cartridges. To obtain maximum accuracy, bullet weight and form are matched to the rifling twist rate of the barrel. Typically, 68-grain (4.4 g) bullets are used in barrels with twist rates of 1:13 (one twist for every 13" in the barrel), while 1:15 barrels can accommodate lighter 58-or-60-grain (3.8 or 3.9 g) accurately. The cartridge developed enough acceptance that rifles chambered for it are available commercially.
Read more about this topic: 6 Mm PPC
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