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What's the best 300BLK barrel length?

What's the best 300BLK barrel length?
March 13, 2023 4551 view(s)

What's the best 300BLK barrel length?

A versatile and well-liked cartridge, the 300 Blackout is also known as the 300 AAC Blackout or 7.62x35mm. It is extremely well suited for hunting, home defense, and suppressed shooting. The performance of the 300 Blackout round depends significantly on the length of the barrel. In the post below, Faxon Firearms helps us explore the benefits and drawbacks of various 300BLK barrel lengths.

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300BLK Barrel Selection: Things to Know

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The main question you need to ask yourself is whether you plan to use a suppressor - which should definitely be a consideration, given the advantages 300 blackout ammo offers (particularly the subsonic loads). Then look at legalities like NFA since the AR pistol + (short) pistol barrel + pistol brace combo is no longer an option. 

You'll also want to take the weapon's intended use into account. The best barrel length for hunting might not be optimal for someone fighting at bad breath difference.

The 300BLK cartridge does not react to a longer barrel like other cartridges (such as the 22lr); .22 rounds gain speed through longer barrels. For instance, a shorter barrel shooting 300BLK will perform better (for that caliber) than 5.56mm, though it will heat up faster. 

There are many 300BLK shooters who say a 9" 300 BLK barrel is the “sweet spot,” but you can go even shorter (like the Faxon Firearms 7.5" or Ballistic Advantage 6"). 

7.5" BLK barrel from Faxon Barrels

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7.5 inch Faxon barrel in 300BLK

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Faxon Barrels: 300 blackout barrel

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How Much Does Barrel Length Affect .300 Blackout Velocity?

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Faxon Firearms advises that based on their personal experience and research, the 9″ 300 BLK 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.

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Best 300 Blackout Barrel Length: Home Defense

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The .300 Blackout round is an excellent choice for home defense as it combines power, efficiency, and lethality even when fired from a short-barreled rifle.

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

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

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Faxon Firearm barrels: 300BLK

10.5 inch Faxon barrel in 300BLK

 

10.5 inch 300BLK barrels from Faxon

 

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Best 300 Blackout Barrel Length: Hunting

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The ideal barrel length when hunting with .300 Blackout 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 velocity, 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.

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

 

16 inch 300 blackout barrel from Faxon Firearms

Faxon Firearms 16" barrel in 300BLK...

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Choosing the right barrel length for the .300 BLK Can Be Hard

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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 optimal barrel length and determining the effective range of the .300 Blackout. 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 -don't just go buy one. Do some research, ask some questions, and make sure you have the one you need.

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Faxon 300 blackout barrel 16 inch

Faxon Firearms 16" barrel in 300BLK...

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Other AR 15 barrel brands:

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Some of the best 300 blackout barrels come from:

Rainier Arms

Aero Precision

Ballistic Advantage (check out their Modern Series barrel options)

Daniel Defense

V Seven Weapon Systems

 

Lean more at SAAMI. 

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