300 Blackout: Tips for Determining the Optimal Barrel Length

300 Blackout Rifles
| June 5, 2023
| 1 Comments
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As a popular cartridge for hunting, home defense, and suppressed shooting, the 300 Blackout round offers excellent flexibility. However, you’ll need to choose the right barrel length to maximize your firearm’s performance. In this post, we let Faxon Firearms take a closer look at the various barrel lengths available for the 300 Blackout and where you can find a 300 Blackout barrel for sale.

The main question you need to ask yourself is whether you plan to use a suppressor. If you’re looking for the quietest and best handling setup, one could easily go as short as 7.5″ (which is offered by Faxon Firearms).

How Much Does Barrel Length Affect .300 Blackout Velocity?

Based on our personal experience and research, the 9″ 300 blackout barrel is the best overall barrel length with or without a suppressor, especially since an 8″ barrel is the minimum warranty barrel length for many suppressor manufacturers.

Best Barrel Length For Suppressed 300 Blackout

For optimal performance with a suppressed 300 Blackout, we (Faxon Firearms) recommend a barrel length of 8″-10″.

Attaching a 6″ suppressor to this barrel length results in a total length of 14″ to 16″, which provides optimal muzzle velocity for accurate long-range shots.

For the longer range engagements with a suppressed .300 BLK, use a 16″ barrel with a suppressor for an average velocity of supersonic ammunition is over 2,630 fps, leading to more effective shots and minimal bullet drop.

Best 300 Blackout Barrel Length For Home Defense

The 300 Blackout round is an excellent choice for home defense as it combines power, efficiency, and lethality when fired from a shorter barrel.

Using a short-barreled rifle is ideal for home defense as its compactness makes it easier to maneuver throughout the home. Despite the lack of barrel length, a .300 BLK rifle round fired from a short barrel can still hit targets up to 100 yards away.

7.5 inch barrel

For optimal home defense with the 300 Blackout, a barrel length of at least 6″ to 8″ is recommended.

Best 300 Blackout Barrel Length For Hunting

The ideal barrel length when hunting with 300 Blackout cartridge is one able to reach long-range targets with sufficient bullet velocity and energy on target for a lethal impact.

Longer barrel lengths offer greater accuracy and a ballistic advantage, with a maximum length of 16″ for the 300 Blackout. This length ensures complete gunpowder combustion to generate maximum force and stabilizes the bullet for a flatter trajectory and improved accuracy.

Faxon Duty Series 16in

Additionally, a 16″ barrel offers a long line of sight for better aim, making it the recommended choice for long-range hunting.

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Where to Find a 300 Blackout Barrel For Sale

 

Additional Complications

At 10″, the muzzle velocity has not yet reached its peak. Heavy subsonic ammo in a 10″ barrel may have lower velocities but allows for the use of a suppressor without damaging your hearing. Supersonic ammo out of a 10″ barrel retains rifle caliber velocities but with more significant bullet drop at longer distances.

At 16″, muzzle velocities are near their maximum. As a result, heavy-grain subsonic bullets struggle to retain their subsonic terminal performance, while supersonic ammo has increased effective range and reduced bullet drop. The 16″ barrel also provides greater energy upon impact, regardless of ammo type.

The barrel twist rate also impacts performance and should be considered when selecting barrel length and determining the effective range of the 300 BLK. For example, a 1:8 twist is best for lightweight supersonic rounds, while the 1:7 twist is recommended for heavy subsonic rounds with a suppressor.

There are a few factors to consider when selecting the ideal barrel length for the 300 BLK rifle and determining its effective range.

For more information on the 300 Blackout cartridge, check out Recoil Magazine.

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1 Comment

  1. mark conrad

    Savage makes a bolt action 300 blackout with a 22-in barrel. What do you recommend the bullet to use and that is?

    Reply

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Gun.deals: back Breach-Bang-Clear

Find what’s in stock, and where, and compare prices. 

⚠️ Some hyperlinks in this article may contain affiliate links. If you use them to make a purchase, we will receive a small commission at no additional cost to you. It’s just one way to Back the Bang. #backthebang