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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 AR-15 can be chambered in many other calibers; it is then often referred to as an AR-15 style rifle.
The 6mm AR / 6x38mm AR is an intermediate centerfire wildcat cartridge initially designed by Robert Whitley [1] for long-range performance in an AR-15 rifle. Description
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.
For an ordinary AR-15 rifle chambered for the .223 Rem/5.56mm NATO, a new barrel, magazine and bolt are required to convert to the 6mm ARC. [7] The 6mm ARC utilizes the same bolt head size as the 6.5mm Grendel , and 6.5mm Grendel-compatible AR-pattern box magazines have also been used successfully with the 6mm ARC. [ 8 ]
6mm PPC; 6mm AR, a 6 mm wildcat version which shares 6.5 Grendel's casing, but sends a (usually) lighter projectile up to 1,000 yards (900 m). 6mm ARC, a factory cartridge with many similarities to the 6mm AR; 6.5×55mm Swedish; 6.5mm Creedmoor; 6.5×42mm, also known as 6.5 MPC (Multi Purpose Cartridge), based on a necked up .223 Remington case ...
6mm AR: 6.2 (.243) 38.7 (1.525) 11.30 (.4449) 11.26 (.4433) 10.98 (.4323) 6.9 (.271) 57.4 (2.260) 6×45mm: 6.2 (.243) 45 (1.76) 9.6 (.378) 9.6 (.377) 9 (.354) 6.9 (.272) 57.40 (2.260) 6mm Lee Navy: 6.2 (.244) 60 (2.35) 11.4 (.448) 11.5 (.443) 10.2 (.402) 7.1 (.278) 79 (3.11) .240 Apex [9].240 Magnum Rimless.240 Magnum Flanged H&H 240 Apex.240 ...
The .308 × 1.5" Barnes, a wildcat from noted cartridge author Frank Barnes made by simply necking a .308 Winchester back to 1.5 inches (38 mm) in length (38.1 mm) is probably the best example of a wildcat that has spawned many other successful wildcats. The .308 x 1.5" case is available from a number of case manufacturers and differs from a ...
8.6mm Blackout (8.6×43 mm), sometimes referred to as 8.6 BLK, [1] is a centerfire rifle cartridge developed by the firearms manufacturer Q, LLC. [6] It utilizes a shortened case from the 6.5mm Creedmoor necked up to an 8.6 mm caliber (8.585 mm or 0.338 in diameter) projectile. 8.6 Blackout is designed for use in bolt-action rifles or as a caliber conversion for AR-10 style rifles.