6PPC. This rifle is built for the 10.5lb Light Varmint BR class, though I shoot it in both light and heavy varmint classes. The action is Viper left bolt, right port feed, drop port eject with a Jewel trigger. The stock is a MacMillan EDGE and the scope is a Leupold Competition 45 power with fine crosshair and dot. The current barrel is a 6 grove, 1/14" Maddco, cut to 21.75", .950" at the muzzle.