6.5×47mm Lapua

6.5×47mm Lapua
Type Rifle
Place of origin  Finland
Production history
Designer Nammo Lapua Oy
Manufacturer Nammo Lapua Oy
Produced 2005–present
Variants 6-6.5x47 Lapua and Long Dasher
Specifications
Bullet diameter 6.71 mm (0.264 in)
Neck diameter 7.41 mm (0.292 in)
Shoulder diameter 11.53 mm (0.454 in)
Base diameter 11.95 mm (0.470 in)
Rim diameter 12.01 mm (0.473 in)
Rim thickness 1.37 mm (0.054 in)
Case length 47 mm (1.9 in)
Overall length 69.5 mm (2.74 in)
Primer type Large rifle for Prototypes, small rifle since start of production
Maximum pressure (C.I.P.) 435 MPa (63,100 psi)
Ballistic performance
Bullet weight/type Velocity Energy
6.7 g (103 gr) Scenar 939 m/s (3,080 ft/s) 3,087 J (2,277 ft·lbf)
8.0 g (123 gr) Scenar 880 m/s (2,900 ft/s) 3,098 J (2,285 ft·lbf)
9.0 g (139 gr) Scenar 820 m/s (2,700 ft/s) 3,028 J (2,233 ft·lbf)
Test barrel length: 27.5
Source(s): Lapua

6.5×47mm Lapua (or 6.5×47mm) is a rifle cartridge that was developed specifically for 300–1000 meter competition by ammunition maker Nammo Lapua and the Swiss rifle manufacturer Grünig & Elmiger AG in 2005.[1]

Features

The cartridge has many special features including:[2]

History

The 6.5x47mm Lapua has no direct parent case. This is obvious in that there are no similar cartridges of this size or dimension with a small rifle primer. It was designed by Lapua with a great deal of help from Swiss rifle manufacturer, Grunig & Elmiger.[4] The case also borrows from many characteristics of the 6mm PPC[5] and thus has been proving itself to be inherently accurate.[6]

Performance

The 6.5×47mm was designed from the beginning by Lapua to optimize accuracy, barrel life, and case capacity in a 6.5mm cartridge for target and tactical shooting. The 6.5×47mm travels at slightly lower speeds than 6.5mm/.260 cartridges such as the .260 Remington, because of its smaller case volume.[7] Its speed though is hotly debated. In an article by the Precision Rifle Blog[8] It was shown that though the average MV was slightly lower then the 6.5 Creedmoor it was able to exceed it. Some users exceeded the 6.5 cm by as much as 42fps. This is probably due to the fact that thought the CM is listed to have the same PSI as the Lapua, it is not able to really reach those pressure levels because of its large primer pocket and lower quality brass.

It has a chamber pressure of 63100 PSI,[9][10] which is slightly higher than the .260 Remington's maximum rated pressure.

So far no other manufacturers have made brass for the 6.5x47. There could be two reasons for this. One is that beating Lapuas quality[11] is too hard and the other is that the Lapua has no true parent case and thus would need an entirely new CUP and tooling to start production.

Competitions

Competitively the 6.5x47 has been winning many records, most of them at 600yards. Erik Cortina broke a 300-yard Club Record with 6.5×47 Lapua (RL17)[12] Erik shot a spectacular 600-49X, the previous record was 599-32X.

Variants

Of course as soon as the new 6.5x47 came out, shooter were necking it down to 6mm. This version is often called a 6-6.5x47[13] to avoid confusing it with a 6x47 Swiss Match.[14] A similar case but with a large rifle primer. Another version that has been popular is a necked down version with a 40d shoulder. PTG sells reamers for this and it has demonstrated a gain of about 100fps over the standard 6-6.5x47.[15]

See also

Notes

  1. ↑ "October 2005 Blog".
  2. ↑ "New Products". Vihtavuori.fi. Archived from the original on 2005-03-07. Retrieved 10 February 2007.
  3. ↑ "6.5x47 Lapua Tactical Rifle Project".
  4. ↑ "6.5x47 Lapua".
  5. ↑ "6mm PPC Cartridge Guide within AccurateShooter.com".
  6. ↑ "6.5×47 Lapua Cartridge Guide within AccurateShooter.com".
  7. ↑ Smith, Zak. "6.5mm Shootout: .260 Remington vs. 6.5x47 Lapua vs. 6.5 Creedmoor".
  8. ↑ Cal. "Best Rifle Caliber - What The Pros Use - PrecisionRifleBlog.com". PrecisionRifleBlog.com.
  9. ↑ Lawrence, Steve; Mobley, Ed. "6.5×47 Lapua Cartridge Guide". AccurateShooter.com. Retrieved 24 January 2016.
  10. ↑ "6,5 x 47 Lapua" (PDF) (20 May 2014 ed.). Commission internationale permanente pour l'épreuve des armes à feu portatives. 16 May 2006. Retrieved 24 January 2016.
  11. ↑ "X-Ray Spectrometry of Cartridge Brass within AccurateShooter.com".
  12. ↑ http://bulletin.accurateshooter.com/2010/04/erik-cortina-breaks-300-yard-f-class-record-with-6-5x47-lapua/
  13. ↑ "6-6.5×47 « Search Results « Daily Bulletin".
  14. ↑ "Mid-Sized Cartridge Comparison « Daily Bulletin".
  15. ↑ 6x47 long dasher

External links

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