.30 Remington AR
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|.30 RAR (.30 Remington AR)|
|Place of origin||United States|
|Parent case||.450 Bushmaster|
|Case type||Rimless, bottleneck|
|Base diameter||.500 in (12.7 mm)|
|Rim diameter||.492 in (12.5 mm)|
|Rim thickness||.054 in (1.4 mm)|
|Case length||1.53 in (39 mm)|
|Overall length||2.26 in (57 mm)|
|Case capacity||44 gr H2O (2.9 cm3)|
|Primer type||Large rifle|
|Maximum pressure||55,000 psi (380 MPa)|
|Test barrel length: 24
The .30 Remington AR cartridge was created in 2008 by Remington Arms to fill a perceived gap in performance on game between the .223 Remington and larger cartridges such as the .308 Winchester and the 6.8 SPC. Design of the cartridge is considered a joint effort between companies under the "Freedom Group" name through a private equity firm  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 designed to fit the dimensional constraints of the AR-15 magazine and is based on a modification of the .450 Bushmaster, which in turn was based on the .284 Winchester.
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. 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 where a larger calibre projectile is required.
A side effect of the short, wide case has meant that the Remington R-15 Rifle which was designed alongside the cartridge uses a four round, single stack magazine.
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