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.30 Remington AR

For the 1906 vintage rimless cartridge, see .30 Remington.
.30 RAR (.30 Remington AR)
Size comparison with .223
TypeRifle, Centerfire
Place of originUnited States
Production history
Designed2008
ManufacturerRemington
Produced2008–present
Specifications
Parent case.284 Winchester
Case typeRimless, bottleneck
Base diameter.500 in (12.7 mm)
Rim diameter.492 in (12.5 mm)
Rim thickness.054 in (1.4 mm)
Case length1.53 in (39 mm)
Overall length2.26 in (57 mm)
Case capacity44 gr H2O (2.9 cm3)
Rifling twist1:10
Primer typeLarge rifle
Maximum pressure55,000 psi (380 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
125 gr (8 g) Corelokt 2,800 ft/s (850 m/s) 2,176 ft⋅lbf (2,950 J)
125 gr (8 g) AccuTip BT 2,800 ft/s (850 m/s) 2,176 ft⋅lbf (2,950 J)
Test barrel length: 24
Source(s): http://accurateshooter.wordpress.com/2008/10/15/remington-introduces-new-30-remington-ar-cartridge/

The .30 Remington AR / 7x39mm Remington AR is an intermediate cartridge created in 2008 by Remington Arms to fill a perceived gap in performance on large game between the .223 Remington and larger cartridges such as the .308 Winchester.[1] The design of the cartridge is considered a joint effort between companies under the "Freedom Group" name through a private equity firm[1] and included such companies as Bushmaster, DPMS and Remington itself. It is a rebated rim cartridge designed to fit Remington's R-15 semiautomatic hunting rifle. It was made to fit the dimensional constraints of the AR-15 magazine and is based on a modification of the .450 Bushmaster, which in turn is based on the .284 Winchester.[2]

Remington was the only company that manufactured this ammunition and its components.[3] The cartridge was a commercial failure and has been discontinued by Remington.

The .30 Remington AR cartridge has a significantly wider diameter than the .223 Remington

Design

Starting with a .450 Bushmaster case, Remington trimmed the length to 1.525 in from the original 1.7 and necked it down to accept a conical .308 in diameter bullet with a 25-degree shoulder.[4]

The rim size is .492 in and because the round generates 55,000 psi, Remington opted to use a .308 rifle bolt in a 5.56-sized rifle for increased case support.[4] The rim was widened from the .473 in of the parent case to prevent the use of a weaker .450 Bushmaster bolt with this cartridge. With a 150 grain bullet, the round travels at 2,575 feet per second (fps).[5]

Performance

Performance tests between the .30 RAR and the .308 Winchester show that while the .30 RAR does have a good muzzle velocity, the energy it is capable of delivering on target at around 400 yards decreases significantly.[6] Combined with the poorer ballistic coefficients of the lighter projectiles (.267 for the 125-grain Core-Lokt), this makes the .30 RAR a cartridge suited to ranges around 300 to 400 yards, although this can be extended with projectiles of higher ballistic coefficient (.341 for the Speer TNT 125 grain).[citation needed]

A side effect of the short, wide case is that the Remington R-15 rifle, which was designed alongside the cartridge, uses a four-round, single-stack magazine.[1]

See also

References

  1. ^ a b c Nischalke, Mike "The R-15 And The .30 RAR", Shooting Times, Online Article, accessed 13 January 2010
  2. ^ Sweeney, Patrick (2010). The Gun Digest Book of The AR-15. Iola, Wisconsin: Gun Digest Books. pp. 174–175. ISBN 978-1-4402-1622-0.
  3. ^ Mann, Richard A. (2014). GunDigest Shooter's Guide to the AR-15. Iola, Wisconsin: Krause Publications. pp. 66–67. ISBN 978-1-4402-3847-5.
  4. ^ a b Woodard, W. Todd (2016). Cartridges of the World: A Complete and Illustrated Reference for Over 1500 Cartridges. Iola, wisconsin: F+W Media, Inc. p. 118. ISBN 978-1-4402-4642-5.
  5. ^ Zwoll, Wayne van (29 November 2012). Gun Digest Shooter's Guide to Rifles. Iola, Wisconsin: Gun Digest Books. p. 124. ISBN 978-1-4402-3076-9.
  6. ^ "Remington Introduces new Remington 30 AR Cartridge". Accurate Shooter Bulletin. 2008. Retrieved 13 January 2010.
Quelle: https://en.wikipedia.org/wiki/.30_Remington_AR