List of AR platform cartridges

The AR platform has become widely popular for various applications, including simple fun, target shooting, hunting, and much more. The names "AR-10" and "AR-15" are actually trademarks of ArmaLite and Colt respectively, but the terms have become essentially ubiquitous in describing any rifle that is based on those platforms. The AR-15 rifle usually comes chambered for either the .223 Remington, or the military's higher-pressure 5.56x45mm NATO, which can safely fire the .223 Remington, while the reverse is highly advised against for safety reasons, due to the possibility of damaging the rifle, or even possible catastrophic failure that will result in injury for the shooter. The AR-15 and AR-10 can also be converted to many other calibers as well, and here we will attempt to create and maintain a definitive list of them all, if possible.

AR-15 Cartridges

Rimfire Cartridges

• .17 HMR
• .17 Mach 2
• .17 Winchester Super Magnum
• .22 Long Rifle - Various dedicated upper receivers, as well as easy to use conversion kits from companies such as CMMG.
• .22 Winchester Magnum Rimfire

Centerfire Cartridges (Imperial)

• .17 Mach IV
• .17 Remington Fireball
• .17 Remington
• .17-223
• .20 Practical
• .20 GPC (wildcat)
• .22 GPC (wildcat)
• .22 Grendel (wildcat) aka .224 Grendel
• .22 Nosler
• .22 PPC
• .204 Ruger
• .222 Remington
• .223 Remington - Original AR-15 cartridge: .223 cartridges may function in a 5.56×45mm rifle, however 5.56×45mm cartridges may produce excessive pressure in a .223 Rem rifle. On the other hand, a .223 Wylde chamber is used on .223 Remington rifle barrels to allow both to safely fire.
• .223 Remington or 5.56×45mm NATO ammunition.
• .223 Winchester Super Short Magnum
• .224 Kritzeck (wildcat of a .223 Remington with shortened neck)
• .224 Valkyrie
• .24 GPC
• .243 LBC
• .243 Winchester Super Short Magnum
• .25 Winchester Super Short Magnum
• .25-45 Sharps
• .257 Ocelot (wildcat)
• .25 GPC (wildcat)
• .26 GPC (wildcat)
• .27 GPC (wildcat)
• .277 Wolverine (semi-wildcat)
• .277 MSR (Dasher Wildcat)
• .28 GPC (wildcat)
• .30 American
• .30 Carbine
• .30 GPC (wildcat)
• .30 Remington AR
• .30 Sabertooth (wildcat)
• .300 OSSM
• .300 AAC Blackout (7.62×35mm)
• .300 Whisper
• .300 HAM'R - Wilson Combat
• .338 SOCOM (wildcat)
• .338 Spectre (wildcat)
• .350 Legend
• .357 Automag (wildcat)
• .358 SOCOM (wildcat)
• .358 Yeti (wildcat)
• .375 Stalker (wildcat)
• .375 SOCOM
• .400 AR (wildcat)
• .40 S&W
• .44 Automag (wildcat)
• .44 Remington Magnum (wildcat)
• .44 SOCOM (wildcat)
• .440 Corbon Magnum (wildcat)
• .45 ACP
• .450 Bushmaster
• .458 HAM'R
• .458 SOCOM
• .475 SOCOM (wildcat)
• .499 LWRC
• .50 Action Express
• .50 Beowulf
• .50 SOCOM (wildcat)

Centerfire Cartridges (Metric)

• 5.45×39mm - Intermediate cartridge originating in the Soviet Union. Based on the 7.62x39, necked down to accept 5.45mm projectiles.
• 5.56×45mm NATO - Original M16A1 cartridge: Can also safely fire .223 Remington, intermediate[1]
• 5.7×28mm - PDW cartridge by FN, used traditionally in the FN P90 PDW, and the FN Five-seveN pistol, and more recently the Ruger-57 pistol.
• 6mm Mongoose (wildcat)
• 6mm ARC - rifle
• 6mm Dasher
• 6mm AR (wildcat)
• 6×45mm - intermediate
• 6.5mm Grendel - intermediate
• 6.5 Timberwolf (wildcat)
• 6.8×39mm (aka .277 Wolverine) - intermediate cartridge that bridges the gap between 5.56 NATO and .300 Blackout.
• 6.8mm Remington SPC - intermediate
• 7mm Valkyrie (wildcat)
• 7.62×33mm (.30 Carbine) - Carbine cartridge originally used in the M1 Carbine.
• 7.62×37mm Musang - PDW cartridge developed in the Philippines by the Filipino government. Unclear if ever used..?
• 7.62×39mm - intermediate
• 7.62×40mm Wilson Tactical - rifle round.
• 7.92x33mm Kurz - intermediate
• 9×19mm Parabellum - pistol cartridge.
• 9×39mm - Russian subsonic rifle round.
• 10mm Auto (10×25mm) - pistol
• 10mm SOCOM (wildcat)