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Lindcott Armory

Rifle · SAAMI

8.6 Blackout

Also known as 8.6 BLK · .338 Blackout

A suppressor-optimized bolt-action cartridge that dominates subsonic performance.

Caliber
0.338″ · 8.585 mm
Introduced
2022
Case
Rimless
Parent
6.5 Creedmoor
Primary use
Hunting, Self-Defense, Long Range
Status
Active

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VelocityBeing verified
EnergyBeing verified
Typical grains210 · 215 · 300 gr
Identity
Introduced
2022
Type
Rifle
Origin
United States
Inventor
Q LLC / Kevin Brittingham
Manufacturer
Q LLC / Hornady
Standard
SAAMI
Status
Active
Availability
Common
Build
Case capacity
36 gr H₂O
Twist (typical)
1:3
Primer
Large Rifle
Case type
Rimless
Pressure & range
Max pressure
62,000 psi
Eff. range
300 yd
Max range
1200 yd
Recoil
8–12 ft·lb
Subsonic
Capable

Ballistics

Published velocity/energy data isn't available for 8.6 Blackout. Parent case: 6.5 Creedmoor.

Performance

Best for Withheld until verified
Best for Withheld until verified
Dimensionscase measurements · scale drawing · size vs familiar rounds

Case dimensions — the scale drawing at the top of the page is built from these.

SAAMI · approximate
Measuremmin✓
Bullet ⌀ 8.590.338 ✓
Neck ⌀ 9.300.366 ~
Shoulder ⌀ 11.770.464 ~
Shoulder angle 30°— ✓
Base ⌀ 11.950.470 ✓
Rim ⌀ 11.990.472 ✓
Belt ⌀ n/a
Rim thickness 1.370.054 ✓
Neck length 8.390.330 ≈
Case length 42.801.685 ✓
Overall length 71.372.810 ~

Size vs familiar rounds

Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. 8.6 Blackout is highlighted below.

Factory loads

Verification

Being verified

Advertised FPS, energy, and BC are withheld until loads clear verification.

Suitable powders

2 reloading powders listed for 8.6 Blackout, fastest to slowest. Cross-reference in the finder →

Lil'GunIMR 4227
Reloading costestimate cost per round vs factory

Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.

Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.

Lineage

Immediate parent
6.5 Creedmoor
Family TreeOpen 8.6 Blackout in the interactive cartridge family tree

Connected reference

Loads12 factory loads for 8.6 BlackoutReloading2 suitable powders — cross-referenceFirearmsFirearms in 8.6 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.

FAQs

What twist rate does 8.6 Blackout use?
8.6 Blackout typically uses a 1:3 twist rate.
What bullet diameter is 8.6 Blackout?
8.6 Blackout uses a 0.338″ (8.585 mm) diameter bullet.
Is 8.6 Blackout still in production?
8.6 Blackout is active; typical availability is common.
What is 8.6 Blackout used for?
8.6 Blackout is primarily used for hunting, self-defense, long range.
What is 8.6 Blackout based on?
8.6 Blackout is derived from the 6.5 Creedmoor case.
What are the best powders for 8.6 Blackout?
Reloading powders commonly listed for 8.6 Blackout include Lil'Gun, IMR 4227.

Sources & provenance

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 12 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →