The .300 Blackout rifle cartridge is also known as 300 AAC Blackout, 300 BLK, and 7.62x35mm. Its design comes from the idea to develop a cartridge more powerful than AR-15’s native 223/5.56, with ballistics similar to those of the 7.62x39mm. This new cartridge had to work reliably with both supersonic and subsonic ammo, in the barrel that is less than 16 inches long. When fired through a suppressor, .300 Blackout bullets give a silent, yet powerful rifle. This ammo can be used for hunting, target shooting, as well as for home defense. Learn more about 300 BLK

Product Per round Price Status/Qty Last change Last update Store
Fiocchi Hyperformance Hunt .300AAC Blackout 125 Grain SST Brass Cased Rifle Ammo, 25 Rounds, 300BLKHA 762344711188 $1.05/rd $26.29 In Stock 3d ago 1h ago Optics Planet
Winchester Ammo USA300BLKX USA 300 Blackout 200 gr Open Tip Range 20 Round Box 020892224582 $1.05/rd $21.06 In Stock 5d ago 2h ago Cape Gun Works
300 AAC Blackout 20 Rounds Ammunition Winchester 150 Grain Polymer Tip $1.06/rd $21.09 In Stock 1h ago 116d ago Wholesale Hunter
REM 26857 L300AAC2BC UMC 300BO BKT 150 FMJ 160/4 047700486604 $1.06/rd $168.85 In Stock 86d ago 18m ago Dack Outdoors
300 AAC Blackout 20 Rounds Ammunition Federal Cartridge 150 Grain Full Metal Jacket Boat Tail $1.06/rd $21.12 In Stock 1h ago 116d ago Wholesale Hunter
Fiocchi 300BLKHA Extrema 300 Blackout 125 gr SST 25 Bx/ 20 Cs 762344711188 $1.06/rd $26.40 In Stock 16d ago 27m ago Acute Firearms
Sellier & Bellot .300 Blackout Ammunition 20 Rounds FMJ 147 Grains SB300BLKB 754908512454 $1.06/rd $21.14 In Stock 63d ago 18m ago Cheaper Than Dirt
FIOCCHI AMO 300 BLACKOUT 125GR SST 25-RD ( 20 BOXES PER CASE ) 762344711188 $1.06/rd $26.45 In Stock 18d ago 51m ago SHTF Tactical
S&B eXergy Blue Solid Copper 300 Blackout 110gr 20/RD 754908512720 $1.06/rd $21.18 In Stock 12d ago 22m ago BattleHawk Armory
Winchester Ammo USA300BLKX USA 300 Blackout 200 gr Open Tip Range 20 Bx/ 10 Cs 020892224582 $1.06/rd $21.20 In Stock 5d ago 27m ago Acute Firearms
Remington Ammunition 26855 50 rounds 047700486505 $1.06/rd $52.99 In Stock 38d ago 2h ago Hot Ammo
Frontier Cartridge FR400 Rifle 300 Blackout 125 gr Full Metal Jacket (FMJ) 20 Bx/ 10 Cs 090255713978 $1.06/rd $21.22 In Stock 18d ago 51m ago SHTF Tactical
HORNADY 300 AAC Blackout 125gr Full Metal Jacket Ammunition | 20 Rounds 090255713978 $1.06/rd $21.22 In Stock 8d ago 2h ago KyGunCo
Fiocchi 300 Blackout 220 Grain Hollow Point Boat Tail Match King 25 Rounds $1.06/rd $26.56 In Stock 1d ago 43m ago Midsouth Shooters Supply
Sig Sauer E300B120 Elite Performance 300 Blackout 125 gr Full Metal Jacket (FMJ) 20 Bx/ 25 Cs 798681619634 $1.06/rd $21.27 In Stock 14h ago 2h ago Cape Gun Works
Winchester Ammo SUP300BLK Super Suppressed 300 Blackout 200 gr Open Tip Range 20 Bx/ 10 Cs 020892224483 $1.06/rd $21.30 In Stock 16d ago 27m ago Acute Firearms
Fiocchi 300BLKHA Extrema 300 Blackout 125 gr SST 25 Bx/ 20 Cs 762344711188 $1.06/rd $26.62 In Stock 14d ago 24m ago White Birch Armory
Sig Sauer E300B120 Elite Performance 300 Blackout 125 gr Full Metal Jacket (FMJ) 20 Bx/ 25 Cs 798681619634 $1.07/rd $21.36 In Stock 8d ago 27m ago Acute Firearms
REM 26857 L300AAC2BC UMC 300BO BKT 150 FMJ 160/4 047700486604 $1.07/rd $170.99 In Stock 78d ago 28m ago GunZoneDeals
Ammo Inc Hunting 300 Blackout, 168gr, Hollow Point Boat-Tail, 20rd Box 818778023608 $1.07/rd $21.39 In Stock 10d ago 7m ago Impact Guns
300 AAC Blackout 25 Rounds Ammunition Fiocchi Ammo 125 Grain SST $1.07/rd $26.77 In Stock 1h ago 116d ago Wholesale Hunter
Sellier & Bellot, Exergy Blue Bullet, 300 Blackout, 110 Grains, 20 Rd Box 754908512720 $1.08/rd $21.49 In Stock 16d ago 10m ago Tombstone Tactical
Sig Sauer Elite Performance 300 Blackout 125 grain Open Tip Match (20 rd box) $1.08/rd $21.49 In Stock 17h ago 1h ago Rivertown Munitions
WIN USA 300BLK 147GR FMJ 20/10 020892231030 $1.08/rd $21.49 In Stock 16d ago 27m ago Acute Firearms
300 AAC Blackout 20 Rounds Ammunition HSM 110 Grain V-Max $1.08/rd $21.54 In Stock 1h ago 116d ago Wholesale Hunter
REM 26855 L300AAC2V UMC 300BO VP 150 FMJ 50/8 047700486505 $1.08/rd $53.85 In Stock 15d ago 1h ago Huligan Arms
Fiocchi Extrema 300 Blackout 220 gr Sierra MatchKing Boat-Tail Hollow Point (BTHP) Subsonic Ammunition 25rd Box 762344711690 $1.08/rd $26.99 In Stock 6d ago 22m ago BattleHawk Armory
Kent Cartridge K123FSP364X6 Fasteel + 12 Gauge 3" 1 1/4 oz 4 6 Shot 25 Per Box $1.08/rd $26.99 In Stock 1d ago 45m ago DEGUNS.NET
Fiocchi 300BLKMB Extrema 300 Blackout 220 gr Sierra MatchKing Boat-Tail Hollow Point (BTHP) 25 Bx/ 20 Cs 762344711690 $1.08/rd $26.99 In Stock 16d ago 10m ago Tombstone Tactical
Kent Cartridge K123FSP36BBX2 Fasteel + 12 Gauge 3" 1 1/4 oz BB Shot 25 Per Box $1.08/rd $26.99 In Stock 1d ago 45m ago DEGUNS.NET
Fiocchi Extrema Rifle 300BLKHA 25 rounds 762344711188 $1.08/rd $26.99 In Stock 562d ago 5m ago FireLine Armory
Fiocchi Extrema Rifle 300BLKHA 25 rounds 762344711188 $1.08/rd $26.99 In Stock 63d ago 10m ago Sahuarita Guns
Kent Cartridge K123FSP362X4 Fasteel + 12 Gauge 3" 1 1/4 oz 2 4 Shot 25 Per Box $1.08/rd $26.99 In Stock 1d ago 45m ago DEGUNS.NET
Remington Ammunition 26855 50 rounds 047700486505 $1.08/rd $53.99 In Stock 9d ago 1h ago United Patriot Supply
REMINGTON UMC 300 AAC 150G FMJ 047700486505 $1.08/rd $53.99 In Stock 49d ago 1m ago HD Tactical
Winchester Silvertip .300 Blackout Ammunition 150 Grain Defense Tip 1900 fps 100 Rounds 020892229891 $1.08/rd $108.00 In Stock 120d ago 24m ago BH Ammo
Federal AE300BLKSUP2 American Eagle Suppressor 300 Blackout 220 gr Open Tip Match (OTM) 20 Bx/ 25 Cs 029465064617 $1.08/rd $21.64 In Stock 29d ago 24m ago Locked Loaded
UMC Ammunition .300 AAC 220gr OTFB 50rd Box 60 rounds 047700490106 $1.08/rd $64.90 In Stock 16d ago 10m ago Tombstone Tactical
Federal AE300BLKSUP2 American Eagle Suppressor 300 Blackout 220 gr Open Tip Match (OTM) 20 Bx/ 25 Cs 029465064617 $1.08/rd $21.66 In Stock 14d ago 18m ago Dack Outdoors
FEDERAL AMERICAN EAGLE 300 BLACKOUT 150GR FMJBT 20 RD AE300BLK1 $1.08/rd $21.69 In Stock 2h ago 9m ago Gun Buyer
REM 26854 L300AAC2 UMC 300BO 150 FMJ 20/10 047700486406 $1.08/rd $21.70 In Stock 6d ago 14m ago Defense Depot
HORN 808794 CUSTOM 300BO 110 CX 25/10 090255720006 $1.09/rd $27.15 In Stock 15d ago 14m ago Defense Depot
Federal AE300BLKSUP2 American Eagle Suppressor 300 Blackout 220 gr Open Tip Match (OTM) 20 Bx/ 25 Cs 029465064617 $1.09/rd $21.73 In Stock 14d ago 14m ago Defense Depot
Federal American Eagle .300 AAC Blackout 150 Grain FMJ Ammunition (20 Rounds) $1.09/rd $21.79 In Stock 1d ago 45m ago DEGUNS.NET
Fiocchi 300BLKHA Hyperformance 300 Blackout 125 gr Super Shock Tip - 100 Rounds - Free Shipping! $1.09/rd $109.00 In Stock 15d ago 1h ago Bereli
Ammo Inc 300B155BTHPA20 Match 300 Blackout 115 gr Boat Tail Hollow Point 20 Per Box/ 10 Case 20 Gauge rounds 818778023790 $1.09/rd $21.84 In Stock 28d ago 7m ago DB Firearms
Winchester Ammo Super Suppressed 300 Blackout 200 gr Open Tip Range Subsonic Ammunition - 20rd Box 020892224483 $1.09/rd $21.88 In Stock 7d ago 22m ago BattleHawk Armory
Armscor USA .300 Blackout Ammunition 20 Rounds Subsonic Sierra BTHP 220 Grains F AC 300AAC-3N 812285022048 $1.10/rd $21.89 In Stock 35d ago 18m ago Cheaper Than Dirt
Ammo Inc Signature .300 Blackout Ammunition 20 Rounds BTHP 168 Grain 818778023608 $1.10/rd $21.89 In Stock 107d ago 18m ago Cheaper Than Dirt
Ammo Inc Signature .300 Blackout Ammunition 20 Rounds BTHP 155 Grain 818778023790 $1.10/rd $21.89 In Stock 107d ago 18m ago Cheaper Than Dirt

300 Blackout Ammo

The .300 AAC Blackout is an intermediate cartridge designed to share ballistics similar to those of the 7.62x39 (AK-47 cartridge). It was developed for use in the M4 carbine and can be fired from a standard 5.56mm AR by only changing out the barrel.

It is also known as:

  • 300 BLK
  • 300 AAC Blackout
  • 7.62x35mm

Advanced Armament Corporation collaborated with Remington Defense to develop a .30 caliber cartridge that would surpass the performance of 5.56mm ammo. This long-contemplated idea of replacing AR-15s native 5.56mm came to life after United States Government launched an international military campaign aka global war on terror after 9/11, and our troops found themselves in unfamiliar geography and unknown situations. The demand for a cartridge that has was more powerful and more silent lead to AAC developing 300 Blackout ammo for special operations forces, using a 5.56mm case cut down to fit a 30- caliber bullet.

When was 300 BLK invented?

Although AR-pattern rifles and carbines had been previously chambered in different 30 calibers, feeding issues were present with each attempt. Many ammunition manufacturers had tried and failed, including Colt Firearms. The solution was found thanks to wildcatters. One of the wildcatted cartridges - .300 Whisper served as a concept to get to the final result, and the one to be submitted to SAAMI. Development began in 2009, with the cartridge approved by SAAMI in 2011.  

What’s the difference between 300 AAC and 5.56 / .223? 

Even though both rifle cartridges are suitable for target shooting, hunting, and home defense, there are a few differences between them.
300 blk bullet is stubbier, thicker, and heavier. 5.56mm NATO requires a longer barrel length, at least 12”. Once you add additional few inches that suppressor takes, it becomes impossible to get a powerful, yet short rifle.
On the other hand, 300 BLK works best in shorter-than-average barrels, which makes it super suitable for suppressed use. 300 blackout works reliably with both supersonic and subsonic ammo, but it shines when using subsonic and a suppressor, giving you a quiet and powerful bullet.
5.56 has a faster velocity and shoots flatter, while 300 penetrates through more material.  

300 BLK overcomes some of the shortcomings of larger calibers while providing the AR 15 with the possibility to shoot a larger round, with only switching the upper receiver.  

.300 AAC Blackout round military use

Netherlands 

The first formal adoption of 300 AAC happened in July 2015, when the Netherlands’ defense material organization bought 195 carbines chambered in this round. These integrally suppressed 300 BLK carbines were purchased for the Dutch Maritime Special Operations Force and modified to for use with ballistic visor helmets. 

United Kingdom 

Ministry of Defense ordered the supply of 300 Blackout ammo on a five-year contract, including the option to extend for an additional five years. The government noted the previous use of this round. 

United States

This round has not yet seen wide use in American Special forces, although SOCOM started using it in 2017, considering offers on how to modify 5.56 to accommodate 300 AAC rounds.   

Popular 300 Blackout Ammo Brands 

  • Remington
  • Fiocchi
  • Hornady
  • Magtech
  • Aguila
  • Sellier & Bellot
  • Barnes 

Which guns use 300 BLK Ammo?

A few popular models, including top-shelf rifles using with both supersonic and subsonic ammo, rifles widely used for home defense, hunting, or target shooting:
  • Daniel Defense DDM4
  • Wilson combat protector
  • IWI-US Tavor X95
  • Springfield Armory Saint
  • SIG MCX VIRTUS PISTOL
  • Ruger Ruger American Ranch Rifle
  • Ruger AR-556
Our selection is in no particular order regarding the best 300 blackout gun. Use this list as your starting point when searching for a weapon that suits you best.
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