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Cartridge of the Week: The 6.5×47mm Lapua

Talyn

SAINT
Founding Member
The 6.5×47mm Lapua
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The 6.5×47mm Lapua is a rimless bottlenecked rifle cartridge that was developed specifically for 328–1,094 yd. (300–1,000 m) competition shooting by ammunition maker Nammo Lapua and the Swiss rifle manufacturer Grünig & Elmiger AG in 2005. 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.

The 6.5×47mm Lapua has (48.0 gr. H2O) cartridge case capacity.
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6.5×47mm Lapua maximum C.I.P. cartridge dimensions. Thanks to the relatively long neck of the 6.5×47mm Lapua, it can be loaded with very long target bullets
All sizes in millimeters (mm) without placing the base of the bullet below the neck. This eliminates the "donut problem" seen by many cases that get reloaded over 20 times. Left to right: Lapua FMJ 144gr, Hornady 123gr loaded to a COAL of 2.71in, and a Hornady 123gr A-Max.


Americans would define the shoulder angle at 30 degrees. The common rifling twist rate for this cartridge is 1 in 7.87 in, 6 grooves, lands diameter of 0.256 in, grooves diameter = 0.264 in, land width = 0.090 in, and the primer type is small rifle.

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 to bore area ratio with ample space for loading relatively long slender projectiles that can provide good aerodynamic efficiency and external ballistic performance for the projectile diameter. The 6.5×47mm Lapua offers slightly lower muzzle velocities than 6.5 mm/.260 cartridges such as the .260 Remington and 6.5 Creedmoor, because of its smaller case volume.

In an article by the Precision Rifle blog a survey of the top 100 shooters in the precision rifle series (PRS) showed that the 6.5 Creedmoor was on average 50 ft/s faster than the 6.5×47mm Lapua. Although the 6.5×47mm Lapua is said to have superior brass quality, depending on manufacturer, compared to the 6.5 Creedmoor. The 6.5×47mm Lapua was the most popular cartridge during the PRS competition in 2015 beating out competing cartridges by more than two thirds.

C.I.P. rules the 6.5×47mm Lapua and 6.5mm Creedmoor both at up to 63,091 psi Pmax piezo pressure and the .260 Remington lower at up to (60,191 psi) Pmax piezo pressure.

Soon after the introduction of the 6.5×47mm Lapua, shooters were using the case as the basis for a new wildcat, by necking it down to 6 mm. This wildcat cartridge is often called a 6-6.5×47 to avoid confusing it with the 6×47 Swiss Match, a similar case but with a large rifle primer.

Another version that has been popular is a necked-down version with a 40-degree shoulder. PTG sells reamers for this and it has demonstrated a gain of about 100 fps over the standard 6-6.5×47.
 
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