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Suppressors Go Mainstream: Spotlight on .338 ARC and 8.6 Blackout

Suppressors Go Mainstream: Spotlight on .338 ARC and 8.6 Blackout

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Travis Pike

With suppressors gaining popularity, the once-daunting $200 tax stamp now seems more manageable due to inflation. This trend has bolstered the suppressed shooting industry, fostering innovations like high-tech suppressors, optimized gas systems, and calibers designed specifically for quiet use. Among these, .338 ARC and 8.6 Blackout stand out as two promising cartridges tailored for suppressors.

.338 ARC and 8.6 Blackout rifles
.338 ARC vs. 8.6 Blackout: Rather than prioritizing extreme range, both cartridges are designed for optimal performance in suppressed setups.

Comparing the Cartridges: Shared Size, Different Goals

These two cartridges have a lot in common. Both cartridges share a bullet diameter of 8.6mm/.338, which is two different measurements saying the same thing.

When I hear .338, I think, big, mean, long-range range rounds in dedicated precision rifles. That’s not the case with the 8.6 Blackout or the .338 ARC. 

Instead of focusing on extreme distance, both are engineered to excel in suppressed setups. Because they use the same-sized projectiles and are intended for suppressor use, I decided to investigate both rounds for comparison and contrast.

.338 ARC vs 8.6 BLK rifles, side by side
.338 ARC vs. 8.6 Blackout. How do they compare?

.338 ARC: Hornady's Suppressor-Specific Development

The .338 ARC is part of Hornady’s Advanced Rifle Cartridge (ARC) series, originating with the 6mm ARC. Designed to bring a new era of rifle cartridges, the .338 ARC has been in development since 2017.

Ballistic Potential and Cartridge Options

The .338 ARC’s intermediate case length limits its power slightly compared to full-sized rifle cartridges but still packs a punch at 1.5 times the power of .300 Blackout. Currently, Hornady’s .338 ARC line includes a 307-grain subsonic load and a 175-grain supersonic load. The supersonic load achieves a respectable 2,050 fps, although this speed is only marginally faster than a high-power 10mm round.

Case Capacity and Gun Options

Built for subsonic use, the .338 ARC’s case capacity is balanced to promote consistency and accuracy, with less case volume for the propellant to shift. This cartridge is compatible with AR-15 platforms, offering a lighter, more accessible alternative to full-power cartridges. However, the conversion from a standard AR-15 setup requires modifications, including a proprietary magazine, bolt, barrel, and gas system.

Silencerco Omega 36M on .338 ARC rifle
.338 ARC offers hard-hitting ballistic performance while staying compact enough for AR-15 platforms.

8.6 Blackout: The Big Brother of .300 Blackout

Developed by Q (the company behind .300 Blackout), the 8.6 Blackout aims to bring a full-sized rifle cartridge to the suppressed shooting scene. Designed for an AR-10 platform, the 8.6 Blackout offers increased ballistic power and versatility.

8.6 Blackout, loaded magazine
8.6 Blackout is ideal for shooters who favor more power and versatility in an AR-10.

Ballistics and Cartridge Variety

With more load options available, the 8.6 Blackout offers better supersonic performance. Supersonic loads reach up to 2,400 fps, with weights ranging from 190 grains to 342 grains. The 8.6 Blackout also benefits from greater case capacity, using a 6.5 Creedmoor parent case that allows for a larger propellant charge and greater overall power.

Case Capacity and Gun Compatibility

Although the 8.6 Blackout’s larger case volume enables greater versatility, it can hinder consistency with subsonic loads due to increased propellant movement. Still, this round offers improved supersonic range compared to the .338 ARC, positioning it as a better option for those seeking more range without sacrificing suppressor compatibility.

8.6 Blackout rifle suppressed with the SilencerCo Omega 36M
The 8.6 Blackout can be used in AR-10 rifles and standard short-action bolt rifles, offering users a range of firearms that don’t require specialized magazines or bolts.

Suppression Capabilities

Both cartridges lend themselves well to suppression, especially when paired with reliable models like SilencerCo’s Omega 36M. This suppressor works seamlessly with either cartridge in both subsonic and supersonic loads, maintaining impressive sound suppression across AR and bolt-action rifles alike.

8.6 Blackout cartridges in a magazine, next to SilencerCo Omega 36m suppressor
The Omega 36M works perfectly for both cartridges.

Final Takeaway

Both the .338 ARC and 8.6 Blackout bring something unique to the suppressed shooting world, catering to different needs within similar bullet sizes. While the .338 ARC’s design focuses on balance and reliability in the AR-15 platform, the 8.6 Blackout is ideal for shooters who favor more power and versatility in an AR-10.

Luckily, suppressing both cartridges is simple. Both would work extremely well with the SilencerCo Omega 36M series suppressors. The Omega 36M will provide an extremely capable suppressor that can use both calibers’ subsonic and supersonic cartridges. It’ll work perfectly on semi-auto or bolt guns and give you the quiet capability you desire. 

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