The 6mm PPC or 6 PPC as it is more commonly refered to is in fact a widcat calibre produced from a necked up .22 PPC which in turn originated from the .220 Russian. The 6mm bullet is of course also the same diameter as the .243.
Developed predominantly for use in Bench Rest shooting out to 300 yards it is an extremely accurate calibre perhaps due to the very uniform velocity produced from short cartridges that are very efficient combustion chambers.
(Left: The 6mm PPC)
The 6 PPC is a great Varmint round and is also occasionally seen amongst UK Deer Stalkers. Although possessing a little less energy than a .243 Winchester it is in fact able to propel a 90grain bullet at 3030 fps producing around 1830 ftlbs of energy at the muzzle and thereby fitting just within the requirments of UK deer legislation.
Bullet weights can range from 60 to 90 grains, however due to the short cartridge cases some claim that it can produce problems when feeding rounds from the magazine into the chamber with some rifle actions.
Clearly an unusual choice for most however I have seen this calibre put to great effect on our smaller species of deer such as Roe and Muntjac.
Typical Ballistics (90 grain Bullet)
Muzzle Energy: 1830 ft/lbs
Muzzle Velocity: 3030 fps