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300 AAC BLACKOUT

300 Blackout ammo was developed by Advanced Armament Corporation and Remington Defense in 2010 and standardized by the Sporting Arms and Ammunition Manufacturers Institute (SAAMI) in 2011, the 300 AAC Blackout (also known as 300 BLK or 7.63x35mm) is a relatively young cartridge, but one that is rapidly gaining in popularity.

The 300 BLK was developed around a long list of design parameters intended to allow the use of .30 caliber projectiles in the AR/M4 platform. Chief among them, the cartridge had to feed reliably from standard 30 round magazines and utilize their full capacity, which previous attempts with the 7.62x39 cartridge (used in the AK-47) failed to do. Other requirements included the ability to operate suppressed or unsuppressed in a short, lightweight configuration.

The propellants used in 300 BLK cartridges tend to be much faster burning than typical rifle powders, meaning the 300 BLK is well suited to pistol-length gas systems and suffers relatively little in the way of velocity when fired from short barrels. This makes the 300 BLK an ideal choice for AR-style pistols or short-barreled rifles. Learn a lot more about what 300 BLK can do in our 300 Blackout Ballistics Guide.

The cartridge uses a shortened 221 Fireball or .223 Remington case, shortened to 35mm with the new case mouth necked down to .308 caliber. Bullet weights for the 300 BLK range from 110 grain to 250grain, with lighter projectiles suited to maximum velocity while the heavier bullets are used for subsonic work and maintain high energy despite limited velocity.

Ballistically, the 300 BLK performs much like the 7.62x39mm cartridge, with a shorter effective range than 5.56x45mm NATO, but with more kinetic energy than the latter. Because of these characteristics, the 300 BLK is well suited to close range combat and for hunters wishing to use the AR platform.

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1 - 20 of 40

  1. 100rds – 300 AAC Blackout Armscor 147gr. FMJ Ammo 100rds – 300 AAC Blackout Armscor 147gr. FMJ Ammo

    $79.95

    $64.95

    $0.65/ppr

    35 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    1088     Casing Type
    Brass     Muzzle Velocity
    1826     Primer Type
    Boxer     Bullet Weight
    147 Grain
  2. 200rds – 300 AAC Blackout Winchester USA 147gr. FMJ Ammo 200rds – 300 AAC Blackout Winchester USA 147gr. FMJ Ammo
    $159.95
    $0.8/ppr

    30 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    1203     Casing Type
    Brass     Muzzle Velocity
    1920     Primer Type
    Boxer     Bullet Weight
    147 Grain
  3. 300 AAC Blackout - 124 Grain FMJ - Sellier & Bellot - 500 Rounds 300 AAC Blackout - 124 Grain FMJ - Sellier & Bellot - 500 Rounds
    $399.95
    $0.8/ppr

    25 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    1285     Casing Type
    Brass     Muzzle Velocity
    2165     Primer Type
    Boxer     Bullet Weight
    124 Grain
    Ballistic Data Available
  4. 1000rds – 300 AAC Blackout Prvi Partizan 125gr. FMJ Ammo 1000rds – 300 AAC Blackout Prvi Partizan 125gr. FMJ Ammo
    $824.95
    $0.82/ppr

    5 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    1340     Casing Type
    Brass     Muzzle Velocity
    2198     Primer Type
    Boxer     Bullet Weight
    125 Grain
    Ballistic Data Available
  5. 200rds – 300 AAC Blackout Winchester USA 125gr. Open Tip Ammo 200rds – 300 AAC Blackout Winchester USA 125gr. Open Tip Ammo
    $169.95
    $0.85/ppr

    41 In Stock

    Bullet type
    Open Tip     Muzzle Energy
    1325     Casing Type
    Brass     Muzzle Velocity
    2185     Primer Type
    Boxer     Bullet Weight
    125 Grain
  6. 200rds – 300 AAC Blackout Ammo Inc. 110gr. V-MAX Ammo 200rds – 300 AAC Blackout Ammo Inc. 110gr. V-MAX Ammo
    $174.95
    $0.87/ppr

    12 In Stock

    Bullet type
    V-MAX     Muzzle Energy
    1407     Casing Type
    Brass     Muzzle Velocity
    2400     Primer Type
    Boxer     Bullet Weight
    110 Grain
  7. 20rds – 300 AAC Blackout Ammo Inc. 150gr. FMJ Ammo 20rds – 300 AAC Blackout Ammo Inc. 150gr. FMJ Ammo
    $17.95
    $0.9/ppr

    ☆☆☆☆☆ 1 Review

    180 In Stock

    ☆☆☆☆☆ 1 Review

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    1140     Casing Type
    Brass     Muzzle Velocity
    1850     Primer Type
    Boxer     Bullet Weight
    150 Grain
  8. 500rds - 300 AAC Blackout Federal American Eagle 150gr. FMJ Ammo 500rds - 300 AAC Blackout Federal American Eagle 150gr. FMJ Ammo
    $449.95
    $0.9/ppr

    45 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Casing Type
    Brass     Muzzle Velocity
    1900     Primer Type
    Boxer     Bullet Weight
    150 Grain
  9. 200rds – 300 AAC Blackout Winchester Subsonic 200gr. Open Tip Ammo 200rds – 300 AAC Blackout Winchester Subsonic 200gr. Open Tip Ammo
    $184.95
    $0.92/ppr

    41 In Stock

    Bullet type
    Open Tip     Muzzle Energy
    499     Casing Type
    Brass     Muzzle Velocity
    1060     Primer Type
    Boxer     Bullet Weight
    200 Grain
  10. 200rds – 300 AAC Blackout Ammo Inc. stelTH 220gr. TMJ Ammo 200rds – 300 AAC Blackout Ammo Inc. stelTH 220gr. TMJ Ammo
    $184.95
    $0.92/ppr

    30 In Stock

    Bullet type
    Total Metal Jacket (TMJ)     Muzzle Energy
    560     Casing Type
    Brass     Muzzle Velocity
    1071     Primer Type
    Boxer     Bullet Weight
    220 Grain
  11. 200rds – 300 AAC Blackout Hornady Frontier 125gr. FMJ Ammo 200rds – 300 AAC Blackout Hornady Frontier 125gr. FMJ Ammo
    $194.95
    $0.97/ppr

    24 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    1313     Casing Type
    Brass     Muzzle Velocity
    2175     Primer Type
    Boxer     Bullet Weight
    125 Grain
  12. 200rds – 300 AAC Blackout Winchester Super Suppressed 200gr. Open Tip Ammo 200rds – 300 AAC Blackout Winchester Super Suppressed 200gr. Open Tip Ammo
    $194.95
    $0.97/ppr

    ☆☆☆☆☆ 1 Review

    31 In Stock

    ☆☆☆☆☆ 1 Review

    Bullet type
    Open Tip     Muzzle Energy
    499     Casing Type
    Brass     Muzzle Velocity
    1060     Primer Type
    Boxer     Bullet Weight
    200 Grain
  13. 20rds – 300 AAC Blackout Sellier & Bellot 124gr. FMJ Ammo 20rds – 300 AAC Blackout Sellier & Bellot 124gr. FMJ Ammo
    $19.95
    $1/ppr

    183 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    1290     Casing Type
    Brass     Muzzle Velocity
    2165     Primer Type
    Boxer     Bullet Weight
    124 Grain
    Ballistic Data Available
  14. 20rds – 300 AAC Blackout Winchester USA 125gr. Open Tip Ammo 20rds – 300 AAC Blackout Winchester USA 125gr. Open Tip Ammo
    $19.95
    $1/ppr

    82 In Stock

    Bullet type
    Open Tip     Muzzle Energy
    1325     Casing Type
    Brass     Muzzle Velocity
    2185     Primer Type
    Boxer     Bullet Weight
    125 Grain
  15. 20rds – 300 AAC Blackout Ammo Inc. stelTH 220gr. TMJ Ammo 20rds – 300 AAC Blackout Ammo Inc. stelTH 220gr. TMJ Ammo
    $19.95
    $1/ppr

    51 In Stock

    Bullet type
    Total Metal Jacket (TMJ)     Muzzle Energy
    560     Casing Type
    Brass     Muzzle Velocity
    1071     Primer Type
    Boxer     Bullet Weight
    220 Grain
  16. 20rds – 300 AAC Blackout Winchester Subsonic 200gr. Open Tip Ammo 20rds – 300 AAC Blackout Winchester Subsonic 200gr. Open Tip Ammo
    $21.95
    $1.1/ppr

    70 In Stock

    Bullet type
    Open Tip     Muzzle Energy
    499     Casing Type
    Brass     Muzzle Velocity
    1060     Primer Type
    Boxer     Bullet Weight
    200 Grain
  17. 500rds – 300 AAC Blackout Hornady American Gunner 125gr. HP Ammo 500rds – 300 AAC Blackout Hornady American Gunner 125gr. HP Ammo
    $574.95
    $1.15/ppr

    6 In Stock

    Bullet type
    Hollow Point     Muzzle Energy
    1313     Casing Type
    Brass     Muzzle Velocity
    2175     Primer Type
    Boxer     Bullet Weight
    125 Grain
  18. 500rds – 300 AAC Blackout Federal American Eagle 220gr. OTM Subsonic Ammo 500rds – 300 AAC Blackout Federal American Eagle 220gr. OTM Subsonic Ammo
    $594.95
    $1.19/ppr

    33 In Stock

    Bullet type
    Open Tip Match     Muzzle Energy
    488     Casing Type
    Brass     Muzzle Velocity
    1000     Primer Type
    Boxer     Bullet Weight
    220 Grain
    Ballistic Data Available
  19. 20rds – 300 AAC Blackout Winchester USA Ready 125gr. OT Ammo 20rds – 300 AAC Blackout Winchester USA Ready 125gr. OT Ammo
    $23.95
    $1.20/ppr

    153 In Stock

    Bullet type
    Open Tip     Muzzle Energy
    1325     Casing Type
    Brass     Muzzle Velocity
    2185     Primer Type
    Boxer     Bullet Weight
    125 Grain
  20. 20rds – 300 AAC Blackout Winchester Super Suppressed 200gr. Open Tip Ammo 20rds – 300 AAC Blackout Winchester Super Suppressed 200gr. Open Tip Ammo
    $23.95
    $1.2/ppr

    101 In Stock

    Bullet type
    Open Tip     Muzzle Energy
    499     Casing Type
    Brass     Muzzle Velocity
    1060     Primer Type
    Boxer     Bullet Weight
    200 Grain

1 - 20 of 40

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300 BLK - Common Questions

Where Does “BLK” Come From?

The name “BLK” is simply an abbreviation of the term “Blackout.” The full name of the cartridge is “.300 BLK” by the Sporting Arms and Ammunition Manufacturers' Institute, but the primary manufacturer calls it the .300 AAC Blackout. You will also see it called the 7.62×35mm by some circles, particularly military-centric groups.

What Types of Firearms Load the .300 BLK?

Similar to the most rifle cartridges created in the past 100 years, the .300 BLK was created for semiautomatic weapons. While there are other types of rifles that can load this cartridge, the vast majority are “AR-style” weapons. It is known as a “carbine cartridge,” meaning it is generally meant for short-barreled rifles.

Is the .300 BLK Interchangeable with the .308 Winchester?

No. These are two different cartridges that are not interchangeable at all. While they have the same bullet diameter (.308 inches), the biggest difference is the length. .308 Remington ammunition is longer in both case and overall length, meaning it has a larger capacity for propellant, which results in superior speed and power. While the .300 BLK is not a slow round, the .308 Winchester generally has muzzle velocities around 2,500 to 3,000 feet per second, while the .300 BLK has speeds around 2,000 to 2,500 feet per second.

How Does the .300 BLK Compare to the .223 Remington?

These are both high-volume cartridges meant for semiautomatic weapons, both have a foundation in military purposes, and both are associated with “AR” style rifles, so a comparison is warranted. However, the differences are vast. The .300 BLK has a larger bullet, with grain sizes as high as 200 or more; the standard bullet size for 223 Rem ammo is 55 grains. The .223 generally has faster velocities, consistently reaching above 3,000 feet per second, while the .300 BLK tends to deliver slightly better muzzle energy.

Can You Hunt with the .300 BLK?

Yes. The .300 BLK is a recent cartridge, and it often takes time for cartridges to work their way into hunting circles. However, the cartridge has many attributes that make it ideal for medium-sized game hunting, including whitetail deer. First, it’s a .308-caliber cartridge, which is one of the most popular sizes for deer hunting. It also has supersonic loads available, which give hunters greater speeds. From a ballistics perspective, it’s very similar to the .30-30 Winchester, which is used for deer hunting in short-range situations. If you want a rifle that can give you enjoyable high-volume target shooting, as well as medium-range hunting capabilities, a weapon that loads the .300 BLK is a fine choice. For hunting, choose expanding rounds such as jacketed hollow points; for target shooting, choose FMJ for better internal performance and affordability.

Recent 300 AAC BLACKOUT Reviews