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The AR-15 rifle usually comes chambered for either the military cartridge 5.56×45mm or the .223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter. [ 1 ]
The .458 SOCOM (11.63×40mmRB) is a moderately large round designed to work in an AR-15 platform.This is achieved by installing a 458 bolt and barrel. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbf (3,261 J), [1] similar to a light .45-70 but with a much smaller case.
Rifles styled like the AR-15 come in many sizes and have many options, depending on the manufacturer. The lower receiver, without the receiver extension, rear takedown pin, and buttstock, is shown at bottom. An AR-15–style rifle is a lightweight semi-automatic rifle based on or similar to the Colt AR-15 design.
.30 Remington AR.30 TC.30-01.30-03 Springfield.30-06 JDJ.30-06 Springfield.303-06.30-30 Winchester.30-378 Weatherby Magnum.30-40 Krag.300 Precision Rifle Cartridge.300-221.300 AAC Blackout.300 H&H Magnum.300 Blaser Magnum.300 ICL Grizzly.300 Lapua Magnum.300 Norma Magnum.300 Remington Short Action Ultra Magnum.300 Remington Ultra Magnum.300 Rook
The .375 SOCOM is a fairly new cartridge, designed by Tromix in 2013. Taking a .458 SOCOM cartridge case and sizing the neck down to .375 caliber, resulted in a hard hitting AR-15 compatible cartridge, that has a considerable velocity and range advantage over the .458 SOCOM as well as other big bore AR-15 cartridges.
Any cartridge candidates for the AR-15 family of rifles must be limited to a cartridge over all length (COAL) of 2.260 inches, in order to fit in the magazines. The .25-45 Sharps cartridge is an AR-15 wildcat that is growing in popularity. It uses .257 caliber bullets (6.5 mm), and popular bullet weights are between 75 and 117 gr.
The ArmaLite AR-15 was designed to be a lightweight rifle and to fire a new high-velocity, lightweight, small-caliber cartridge to allow infantrymen to carry more ammunition. [ 11 ] In 1959, ArmaLite sold its rights to the AR-15 to Colt due to financial difficulties and limitations in terms of manpower and production capacity. [ 1 ]
With normal bullet weights between 300 and 400 grains (19 and 26 g), overall cartridge length shorter than that of an AR-15 magazine well, and holding to pressures of 33,000 psi limited by the AR bolt strength system, [2] the .50 Beowulf is best described as a low-velocity, heavy caliber, making its ballistics roughly equivalent to those of ...