Video summary

Is 300BLK finally dead?

Main summary

Key takeaways

Product Review

Product reviewed / compared

The video compares three subsonic, suppressed AR-style rifle calibers for performance and practicality:

  • .300 Blackout
  • .338 ARC
  • .86 Blackout (often associated with Q’s “Boom Box” setup)

Key tests & findings (performance)

1) Drywall penetration (15 sheets spaced)

  • .300 Blackout

    • Bullet stayed perfectly straight
    • No tumbling or diverting
    • “Punched through absolutely everything” with zero tumbling

  • .338 ARC

    • Also stayed straight with little to no diversion/tumbling
    • Appears similarly stable in high-speed footage

  • .86 Blackout

    • Zero diversion
    • Described as slightly more dusty

Conclusion from drywall: essentially none of the rounds meaningfully changed behavior—they all penetrated deeply with limited visible deviation.

2) Plywood penetration (15 sheets)

  • .300 Blackout

    • Went through all
    • Hit the dirt berm
    • Possible slight keyholing at the very end only

  • .338 ARC

    • Diverted left noticeably
    • Immediately keyholed
    • Then tumbled sideways before clipping and striking in dirt

  • .86 Blackout

    • Hit high on the berm (suggesting some diversion)
    • Ended sideways
    • Diverted slightly right after passing through

3) Condensed stacks (drywall + plywood attempt to stop rounds)

With thicker/condensed material, the host notes that subsonic rounds can keep drilling through.

  • .338 ARC: described as the one that could be stopped with added material/stacking (“It stopped”).
  • .86 Blackout: “barely stopped,” requiring specific board arrangements to disrupt it.
  • .300 Blackout: mostly behaves as expected—punches a pinhole, creates an exit hole, and continues through unless the stack is sufficient.

4) Watermelon / kinetic-energy-style comparison (high-speed camera)

General pattern: subsonic rounds behave more like “carrying through” rather than supersonic-style violent expansion (e.g., .223).

  • .300 Blackout: “zipped through,” carried some parts; less dramatic reaction
  • .338 ARC: “more eventful” / blew it up more than .300
  • .86 Blackout: mainly a slight pinhole / not much watermelon effect compared with .338

Conclusion from melons: bigger terminal effect with .338 ARC, while .86 is described as punching through.

Sound signature (suppressed noise)

  • .300 Blackout: “poppier,” but generally not unpleasant
  • .338 ARC: sound comparison is limited because of different can lengths and ammo weights; described as louder than .86
  • .86 Blackout: described as the quietest and most pleasant
    • “sounds like somebody snapping a finger” / “definitely the quietest.”

Note: fairness is limited because the host explicitly mentions different suppressors/barrel lengths.

Pros & cons mentioned (overall product/practicality)

.300 Blackout

Pros

  • Cheapest ammo of the three
  • Largest ammo selection by far
  • Huge suppressor capability
  • Uses the standard AR-15 platform
  • Strong parts ecosystem (shares many components with the 5.56/AR-15 ecosystem)
  • “Most proven track record,” easy to find locally (jokingly compared to being available even at Walmart)

Cons

  • Lowest energy
  • Lightest projectiles
  • Less energy retention at distance
  • “Everybody already has one” (social/variety downside)

Host takeaway: best “safe option” to start, especially if you don’t want to hunt for ammo/parts.

.338 ARC

Pros

  • Based on AR-15 platform (no AR-10 requirement)
  • More energy than .300 Blackout
  • Heavier bullets and better retained energy at distance
  • Excellent subsonic performance
  • More efficient design than .86 (host’s claim)
  • “Performance is there” and positioned as better in almost every way than .300—except availability

Cons

  • Ammo availability not universal yet
  • More expensive than .300
  • Newer caliber → fewer manufacturers → smaller aftermarket
  • Fewer factory loads overall

Host takeaway: if money/availability isn’t an issue, .338 is framed as a performance upgrade with fewer platform costs than .86.

.86 Blackout

Pros

  • Most energy on target
  • Heaviest bullets and best terminal performance (host’s claim)
  • Tuned for hunting; referenced as popular for big-game (Africa examples)
  • Highest twist rate mentioned: 1:3 twist (described as ideal for SBR suppressed platform)
  • “Sounds fantastic” suppressed; host calls it the best-sounding suppressed caliber they own
  • Specific rifle mention: Q Fix in .8.6 and the “Boom Box” cool factor

Cons

  • Most expensive ammo and most expensive rifles/setup
  • Requires AR-10 platform (expensive)
  • Least ammo available
  • Hard to find locally; fewer makers and less market traction

Host takeaway: performance/cool factor is great, but cost and scarcity are major downsides.

Comparisons / “who wins?” statements

  • The host says: no clear loser—they all have tradeoffs.
  • If you already own .300 Blackout, the host argues upgrading to .338 or .86 isn’t enough to justify replacing everything or rebuilding your setup.
  • If you want more than .300, stepping up to .338 or .86 is framed as “awesome/fun,” especially for people with multiple .300 builds.

Extra performance claim

  • .338 ARC allegedly has more foot-pounds of energy at ~300 yards than .86 (host states this).
  • The host also claims .86 still has energy over .338 and .300 (distance context is not precisely defined).

Overall pros/cons vs user experience

  • .300 Blackout experience: easiest ownership (cheap, widely available, tons of parts, proven)
  • .338 ARC experience: better performance than .300 with AR-15 convenience, but you pay more and may struggle to find ammo
  • .86 Blackout experience: best sound + cool factor + top terminal performance, but it’s the most expensive and hardest to source

Verdict / recommendation (based on the video)

  • Recommended for most people starting out or who already own a .300 Blackout setup: Stay with .300 Blackout unless you specifically want higher-end performance/novelty of newer calibers.

  • Best “upgrade” path for performance without AR-10 costs: .338 ARC (with ammo availability as the biggest limiter).

  • Best if cost/scarcity doesn’t matter and you want maximum “cool factor”/best terminal performance/sound: .86 Blackout, framed as expensive to set up and expensive to shoot.

Unique points mentioned (deduplicated)

  1. .300 Blackout historically called the “king” of suppressed subsonic shooting.
  2. .86 Blackout presented as a “bigger, meaner” new contender from Q.
  3. .338 ARC presented as an AR-15 alternative that “hits harder than .300.”
  4. Drywall test (15 sheets spaced): straight-line performance for all three.
  5. Plywood test (15 sheets): .338 and .86 show more keyholing/diversion than .300.
  6. Condensed stacks: .338 sometimes stopped with added material; .86 “barely stopped.”
  7. Subsonic rounds described as acting like high-speed drill bits (low tumbling/diversion in many cases).
  8. Watermelon results: .300 and .86 showed limited effects; .338 was more eventful.
  9. Sound fairness caveat: different cans/barrel lengths affect comparison.
  10. Claimed sound ranking: .86 quietest, .300 “poppier,” .338 louder.
  11. .300 pros: cheap ammo, widest selection, standard AR-15 platform, huge parts ecosystem, proven.
  12. .300 cons: lowest energy and projectile weight; less energy retention; “everyone has one.”
  13. .338 pros: AR-15 platform, more energy than .300, heavy bullets, good retained energy, excellent subsonics, efficient vs .86.
  14. .338 cons: harder to find ammo, more expensive, fewer manufacturers and fewer aftermarket options.
  15. .86 pros: most energy, best terminal performance, great hunting cartridge, high twist rate (1:3), best suppressed sound, “Boom Box” cool factor.
  16. .86 cons: AR-10 required (expensive), most expensive ammo/rifles, lowest availability; stock sells out fast.
  17. “No clear loser” overall.
  18. If you already own .300, switching isn’t worth it (per host).
  19. Extra claim: .338 has more energy than .86 at ~300 yards; .86 retains energy better than both at some (unspecified) ranges.
  20. Host intends to build/test .338 more seriously.

Different speakers / voices

  • Primary host/narrator: runs all tests (drywall, plywood, stacks, watermelon) and provides the majority of pros/cons and conclusions.
  • Minor audience/other-person input: a couple reactions used to confirm what the high-speed footage shows.
  • No separate reviewers with their own structured pros/cons beyond the host.

Original video