The 6.5×47mm Lapua (designated as the 6,5 × 47 Lapua by the C.I.P.) is a smokeless powder rimless bottlenecked rifle cartridge that was developed specifically for competition shooting by ammunition maker Nammo Lapua and the Swiss rifle manufacturer Grünig & Elmiger AG in 2005. Other common names for this cartridge include 6.5×47mm. Features The cartridge has many special features, including: The cartridge chamber dimensions are optimized for target bullets. High pressure level ( Pmax piezo pressure) and cartridge case capacity enables relative high velocity and flat trajectory. Reduced barrel wear compared to 6mm Norma BR The 6.5×47mm Lapua has a base diameter and overall length similar to the 7.62×51mm NATO/.308 Winchester, allowing it to accept the same bolt heads and fit into similar short actions and magazines. A small rifle primer that is easier to seat and allows for higher case pressure than a large rifle primer. History The 6.5×47mm Lapua has no direct parent case. It was designed by Lapua with a great deal of help from Swiss rifle manufacturer, Grünig & Elmiger. The case also borrows many characteristics from the 6mm PPC and has proven itself to be inherently accurate. Cartridge dimensions The 6.5×47mm Lapua has 3.11 ml (48.0 grains H2O) cartridge case capacity. 6.5×47mm Lapua maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm). Americans would define the shoulder angle at alpha/2 = 30 degrees. The common rifling twist rate for this cartridge is 200 mm (1 in 7.87 in), 6 grooves, Ø lands = , Ø grooves = , land width = , and the primer type is small rifle. According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 6.5×47mm Lapua can handle up to Pmax piezo pressure. In C.I.P. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers. This means that 6.5×47mm Lapua chambered arms in C.I.P. regulated countries are currently (2018) proof tested at PE piezo pressure. Performance The 6.5×47mm Lapua is a medium power cartridge often compared to the .260 Remington and 6.5 Creedmoor. It was designed from the beginning by Lapua to optimize accuracy, barrel life, and case capacity in a 6.5 mm cartridge for target and tactical shooting. As such it couples a sensible case volume (3.11 ml) to bore area (34.59 mm2/0.3459 cm2) ratio with ample space for