Cartridge of the Week: The 6mm PPC.


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The 6mm PPC

The 6mm PPC (Palmisano & Pindel Cartridge), or 6 PPC as it is more often called, is a centerfire rifle cartridge used almost exclusively for benchrest shooting. It is one of the most accurate cartridges available at distances of up to 300 meters. This cartridge's accuracy is produced by a combination of its stout posture, being only 1.22 in. long, and aggressive shoulder angle of 30 degrees. Its primary use has been benchrest shooting matches since the 1980s.

The cartridge is a necked-up version of the .22 PPC which is in turn based on a .220 Russian (5.6×39mm). The standard bullet diameter for 6mm 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 gr. bullets are used in barrels with twist rates of 1 in 13 inch, while 1 in 15 in. barrel twists can accommodate lighter 58 or 60 gr. accurately. The cartridge developed enough acceptance that rifles chambered for it are available commercially.


Lapua, Norma and Sako make 6mm PPC brass.

During its early development, accuracy experts noted that perfectly concentric thicknesses of the cartridge neck were beneficial in aligning the bullet with the bore. Most 6PPC chamber reamers are ground with a tight neck section to create a cartridge with a concentric fit and consistent neck-to-chamber clearance. This contributes to the 6PPC's accuracy.

Ballistic Performance
Bullet mass/typeVelocityEnergy
60 gr (4 g) HP3,300 ft/s (1,000 m/s)1,452 ft⋅lbf (1,969 J)
70 gr (5 g) SX3,250 ft/s (990 m/s)1,641 ft⋅lbf (2,225 J)
Test barrel length: 24"