Hornady's AR-15 compatible .22 caliber cartridge that rivals .22-250 Remington from a semi-automatic platform. The sibling to 6mm ARC in the same case family.
Type: Rifle
Introduced: 2024, United States
Parent case: 6mm ARC
Standardization: SAAMI
Bullet diameter: 0.224" (5.69 mm)
Case length: 1.521" (38.63 mm)
Overall length: 2.26" (57.4 mm)
Max pressure: 52,000 PSI
Rim type: Rebated
Primer: Small Rifle
Typical twist rate: 1:7
Muzzle velocity: 3200–3700 fps
Muzzle energy: 1405–2430 ft-lbs
Effective range: 600 yd
Common bullet weights: 55, 62, 75, 80 gr
Primary use: Hunting, Varmint, Competition
Production status: Active
Also known as: .22 Advanced Rifle Cartridge
History: Introduced by Hornady in 2024 using the 6mm ARC case necked to .22 caliber. The larger case compared to 5.56mm allows heavier, higher-BC bullets while maintaining AR-15 magazine and bolt compatibility. Targets varmint hunters and long-range paper shooters who want .22-250 performance from a semi-auto.
Notable firearms: Various AR-15 platform rifles
Similar cartridges: .22-250 Remington, .224 Valkyrie, 6mm ARC