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
Armscor USA 300 AAC Blackout Ammo 208 Grain AMAX Case of 200 (10 Boxes of 20) - Free Shipping - brass case 812285021775 $1.35/rd $269.90 In Stock 154d ago 4m ago Target Sports USA
Hornady BLACK 300 AAC Blackout Ammo - 200 Rounds of 208 Grain... 10090255808916 $1.35/rd $269.99 In Stock 6d ago 48m ago Ammo.com
Hornady - A-MAX - 208 Grain 300 AAC Blackout Ammo - 200 Rounds 10090255808916 $1.35/rd $270.00 In Stock 20d ago 2h ago CheapAmmo.com
300 AAC Blackout - 208 Grain A-MAX - Hornady BLACK - 200 Rounds 090255808919 $1.35/rd $270.00 65 83d ago 44m ago Lucky Gunner
HORN 80873 BLACK 300BO 110 VMAX 20/10 $1.35/rd $27.02 In Stock 4d ago 47m ago Gun Buyer
Fusion Ammunition .300 AAC 150gr Bonded Soft Point 20 Round Box 604544624113 $1.35/rd $27.03 In Stock 7h ago 44m ago Tombstone Tactical
REMINGTON Subsonic 300 AAC Blackout 220gr Open Tip Flat Base Ammunition | 20 Rounds 047700479903 $1.35/rd $27.07 In Stock 7d ago 26m ago KyGunCo
FEDERAL FUSION 300 BLACKOUT 150GR FBSP 20 RD F300BMSR2 $1.35/rd $27.07 In Stock 4d ago 47m ago Gun Buyer
Nosler 51275 Match Grade 300 Blackout 220 gr Custom Competition 20 Bx/ 10 Cs 054041512756 $1.36/rd $27.09 In Stock 41d ago 51m ago Dack Outdoors
Sig Sauer E300H120 Elite Copper Hunting 300 Blackout 120 gr Open Tip Match (OTM) 20 Bx/ 10 Cs 798681552979 $1.36/rd $27.09 In Stock 52d ago 51m ago Dack Outdoors
Federal 300BLK150LFA Power-Shok 300 Blackout 120 gr Copper Hollow Point 20 Bx/ 25 Cs 604544627756 $1.36/rd $27.10 In Stock 29d ago 25m ago Locked Loaded
Remington UMC 300BLK 220 Grain 20Rd Box $1.36/rd $27.11 In Stock 4d ago 47m ago Gun Buyer
Hsm 300 Aac 125gr Sierra Jsp - 20rd 25x/cs 837306007200 $1.36/rd $27.15 In Stock 14d ago 1h ago Tactical Surplus USA
Hornady 80881 Custom 300 Blackout 135 gr Flex Tip eXpanding 20 Per Box/ 10 Cs 090255808810 $1.36/rd $27.17 In Stock 11d ago 57m ago Hinterland Outfitters
Armscor USA .300 AAC BLACKOUT, 208gr, GMJ - 20 Rounds [MPN: FAC300AAC2N] 812285021775 $1.36/rd $27.17 In Stock 42d ago 21m ago Firearms Depot
Atomic Subsonic HPBT 00465 50 rounds 858767004652 $1.36/rd $67.99 In Stock 2d ago 1h ago Elite FIrearms Online
REMINGTON UMC .300 aac blackout 220 grain open tip flat base (otfb) 50 rounds 047700490106 $1.36/rd $67.99 In Stock 3d ago 18m ago Guns.com
Remington Ammunition UMC L300AAC4V 50 rounds 047700490106 $1.36/rd $67.99 In Stock 75d ago 1h ago Elite FIrearms Online
Remington Ammunition UMC L300AAC4V 50 rounds 047700490106 $1.36/rd $67.99 In Stock 76d ago 16m ago Griswald Defense
Hunting Shack 300BLK3N Game King 300 AAC Blackout/Whisper (7.62X35mm) 125 GR Spitzer - 20rd Box $1.36/rd $27.23 In Stock 6h ago 14m ago Classic Firearms
Federal AE300BLKSUP2 American Eagle Suppressor 300 Blackout 220 gr Open Tip Match (OTM) 20 Bx/ 25 Cs 029465064617 $1.36/rd $27.24 In Stock 70d ago 31m ago The Armories
Remington Ammunition UMC Value Pack 300 Blackout 220 gr Open Tip Flat Base 50 Per Box $1.36/rd $68.09 In Stock 23h ago 16m ago DEGUNS.NET
SIG SAUER Elite Performance .300 Blk OTM 125 Grain 20 Rounds $1.36/rd $27.27 In Stock 43d ago 57m ago BH Ammo
Nosler 300blk 220gr Cc 20/200 054041512756 $1.36/rd $27.29 In Stock 14d ago 1h ago Tactical Surplus USA
Hornady 80873 Black 300 Blackout 110 gr Hornady V Max 20 Per Box $1.36/rd $27.29 In Stock 3h ago 16m ago DEGUNS.NET
Hornady Black 208 Grain A-Max Brass .300 AAC Blackout Rifle Ammo $1.36/rd $27.29 In Stock 3h ago 16m ago DEGUNS.NET
Win Silvertip Win 150gr 20/200 300blk 020892229891 $1.36/rd $27.29 In Stock 14d ago 1h ago Tactical Surplus USA
Remington UMC .300 AAC Blackout 220gr Open Tip Match Flat Base 20rd Box 047700414805 $1.36/rd $27.29 In Stock 86d ago 10m ago Impact Guns
HSM 300BLK1N Match 300 Blackout 208 gr A-Max 20 Bx/ 25 Cs 837306006777 $1.36/rd $27.30 In Stock 18d ago 24m ago SHTF Tactical
Hornady Custom, .300 AAC Blackout, FTX, 135 Grain, 20 Rounds $1.37/rd $27.35 In Stock 4d ago 48m ago Sportsman's Guide
Hornady 80881 Custom 300 AAC Blackout/Whisper (7.62x35mm) 135 GR Flex Tip Expanding 20 Bx/ 10 Cs 090255808810 $1.37/rd $27.37 In Stock 67d ago 40m ago Foundry Outdoors
Doubletap Ammunition .300 AAC BLACKOUT, 125gr, TMK - 20 Rounds [MPN: 300BLK125CT] 753387048553 $1.37/rd $27.37 In Stock 27d ago 21m ago Firearms Depot
Hornady Frontier .300 AAC Blackout Ammunition 20 Rounds 125 Grain Full Metal Jacket 2175fps 090255713978 $1.37/rd $27.38 In Stock 26d ago 51m ago Cheaper Than Dirt
SIERRA OTDMST 300BLK 115GR HP 20/200 092763600214 $1.37/rd $27.44 In Stock 18d ago 24m ago SHTF Tactical
Sig Sauer Elite Match Grade 300BLK 125GR OTM 20Rd E300A1 $1.37/rd $27.45 In Stock 4d ago 47m ago Gun Buyer
Federal 300BLKB Standard Power-Shok 300 Blackout 150 gr Soft Point (SP) - 20rd Box $1.37/rd $27.46 In Stock 2h ago 14m ago Classic Firearms
Remington Silencer Subsonic 300 Blackout 220gr, OTFB, 20rd Box 047700479903 $1.38/rd $27.49 In Stock 86d ago 10m ago Impact Guns
300 AAC Blackout 20 Rounds Ammunition Federal Cartridge 150 Grain Soft Point $1.38/rd $27.49 In Stock 29m ago 116d ago Wholesale Hunter
Remington Ammunition L300AAC4 UMC 300 AAC Blackout 220 GR Open Tip Flat Base (OTFB) 20 Bx/ 10 Cs 047700414805 $1.38/rd $27.49 In Stock 16d ago 28s ago Acute Firearms
300 AAC Blackout 20 Rounds Ammunition Sig Sauer 125 Grain Sierra Match King $1.38/rd $27.52 In Stock 29m ago 116d ago Wholesale Hunter
SIG Marksman Subsonic, 300 BLK, Sierra MatchKing Open Tip Match, 220 Grain, 20 Rounds $1.38/rd $27.54 In Stock 35d ago 48m ago Sportsman's Guide
Hornady Subsonic, .300 Blackout, Sub-X, 190 Grain, 20 Rounds $1.38/rd $27.54 In Stock 23d ago 48m ago Sportsman's Guide
.300 Blackout Ammunition 20Rds Hornady AMAX 208Gr 812285021775 $1.38/rd $27.55 In Stock 15d ago 44m ago Tombstone Tactical
HSM 300BLK4N Match 300 Blackout 220 gr Hollow Point Boat Tail (HPBT) 20 Bx/ 10 Cs 837306006784 $1.38/rd $27.58 In Stock 17d ago 25m ago Locked Loaded
300 AAC Blackout 20 Rounds Ammunition Armscor Precision Inc 208 Grain Ballistic Tip $1.38/rd $27.59 In Stock 29m ago 116d ago Wholesale Hunter
Sig Sauer E300A120 Elite Match Grade 300 Blackout 125 gr Open Tip Match (OTM) 20 Bx/ 25 Cs $1.38/rd $27.59 In Stock 23h ago 16m ago DEGUNS.NET
Sierra A462510 GameChanger 300 Blackout 125 gr Tipped GameKing 20 Bx/ 10 Cs 612710135424 $1.38/rd $27.60 In Stock 14d ago 21m ago Beebe Family Arms & Munitions
300 AAC Blackout 20 Rounds Ammunition Hornady 135 Grain Flex Tip Expanding $1.38/rd $27.60 In Stock 29m ago 116d ago Wholesale Hunter
Atomic Ammunition Subsonic 300 Blackout 220 Grain Hollow Point Boat Tail 50 Rounds $1.38/rd $68.99 In Stock 23h ago 17m ago Midsouth Shooters Supply
Remington Ammunition UMC L300AAC4V 50 rounds 047700490106 $1.38/rd $68.99 In Stock 48d ago 2h ago Miami Police Depot

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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