A suppressor-optimized bolt-action cartridge that dominates subsonic performance. 300-grain bullets at 1,020 fps subsonic — or 250-grain bullets at over 2,200 fps supersonic from the same barrel.
Type: Rifle
Introduced: 2022, United States
Parent case: 6.5 Creedmoor
Standardization: SAAMI
Bullet diameter: 0.338" (8.59 mm)
Case length: 1.685" (42.8 mm)
Overall length: 2.81" (71.37 mm)
Max pressure: 62,000 PSI
Rim type: Rimless
Primer: Large Rifle
Typical twist rate: 1:3
Muzzle velocity: 1000–2250 fps
Muzzle energy: 444–2815 ft-lbs
Effective range: 600 yd
Common bullet weights: 200, 250, 300 gr
Primary use: Hunting, Self-Defense, Long Range
Production status: Active
Also known as: 8.6 BLK · .338 Blackout
History: Introduced by Q LLC (founded by Kevin Brittingham, also founder of SilencerCo) in 2022. Designed around suppressed bolt-action rifles for hunting, inspired by the 9x39mm Russian subsonic sniper concept. The Q Fix and Q Honey Badger platform uses it. SAAMI standardized in 2023.
Notable firearms: Q Fix, Ruger American Predator (8.6 BLK)
Similar cartridges: .300 AAC Blackout, .338 Federal, 9x39mm Russian