8.6mm Blackout

8.6 mm Blackout (8.6×43 mm), also sometimes referred to as 8.6 BLK or 8.6 Creedmoor,[1] is a centerfire rifle cartridge developed by the firearms manufacturer Q, LLC.[3] 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 and designed for use in bolt action rifles or as a caliber conversion for AR10 and AR-308 rifles. The 8.6 Blackout has been designed for barrels using a 76 mm or 102 mm (1:3 in or 1:4 in) twist rate and bullet weights between 10.4–14.6 g (160–225 gr) for supersonic loads and 18.5–22.7 g (285–350 gr) for subsonic loads.[4]

8.6mm Blackout
TypeCenterfire rifle
Place of originUnited States
Production history
DesignerQ, LLC
Produced2022–present
Specifications
Parent case6.5mm Creedmoor[1]
Case typeRimless, bottleneck
Bullet diameter8.611 mm (0.3390 in)
Neck diameter9.40 mm (0.370 in)[1]
Shoulder diameter11.531 mm (0.4540 in)[1]
Base diameter11.946 mm (0.4703 in)[1]
Rim diameter12.01–0.25 mm (0.4728–0.0098 in)[1]
Rim thickness1.37–0.25 mm (0.0539–0.0098 in)[1]
Case length42.80 mm (1.685 in)[1]
Overall length63.25–71.75 mm (2.490–2.825 in)[1]
Rifling twist76–102 mm (1:3–1:4")
Primer typeSmall rifle or large rifle (depending on casing)
Ballistic performance
Bullet mass/type Velocity Energy
18.66 g (288 gr) Gorilla Fracturing Subsonic 320 m/s (1,000 ft/s) 955.5 J (704.7 ft⋅lbf)
Test barrel length: 406 mm (16.0 in)
Source(s): [2]

See also

References
  1. "8.6 Creedmoor or 8.6 BLK or 8.6 Blackout?". LoadDevelopment.om. 18 November 2021. Retrieved 2021-12-27.
  2. Gorilla Silverback, 8.6 Blackout, 288gr Fracturing Subsonic Ammunition
  3. Burton, James. "8.6 Blackout Approaches – A 2022 Update with Q's Kevin Brittingham - AR Build Junkie". Retrieved 2022-05-06.
  4. "8.6 Blackout: Your Questions Answered". Faxon Firearms. Retrieved 2022-05-06.
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