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
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $7.32/rd $14.64 In Stock 16d ago 6m ago Acute Firearms
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $6.14/rd $12.29 In Stock 18d ago 60m ago SHTF Tactical
Weatherby B340225TTSX Select Plus 340 Wthby Mag 225 gr Barnes Tipped TSX Lead Free 20 Bx/ 10 Cs $5.90/rd $117.99 In Stock 22h ago 53m ago DEGUNS.NET
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $5.52/rd $11.04 In Stock 15d ago 13m ago Huligan Arms
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $5.50/rd $10.99 In Stock 78d ago 7m ago GunZoneDeals
A-Zoom 12271 Rifle Snap Caps300 BO 2 Pkg. 666692122712 $5.20/rd $10.41 In Stock 15d ago 27m ago Dack Outdoors
Underwood Subsonic 300 Blackout, 194gr, Monolithic Hollow Point, 20rd Box 816874022570 $4.58/rd $91.59 In Stock 70d ago 16m ago Impact Guns
Nosler Match Grade Custom Competition 7.62 x 35mm 220-Grain Centerfire Rifle Ammunition $4.28/rd $29.99 In Stock 2d ago 1h ago Academy
Lehigh Defense Maximum Expansion .300 BLK Ammo 194 Grain HP Subsonic 20 rounds 810025509835 $3.98/rd $79.56 In Stock 2d ago 25m ago Cheaper Than Dirt
Buffalo Bore Ammunition 18B/20 Pistol 500 S&W Mag 440 gr Gas Checked Lead Flat Nose 20 Bx/ 12 Cs $3.89/rd $77.79 In Stock 22h ago 53m ago DEGUNS.NET
Underwood Ammunition 300 AAC Blackout Subsonic 194 Grain Lehigh Maximum Expansion Lead-Free Box of 20 816874022570 $3.65/rd $72.99 In Stock 29d ago 1h ago MidwayUSA
LEHIGH MAX EXP 300BLK 194GR 20/200 20 Gauge rounds 810025509835 $3.64/rd $72.82 In Stock 2d ago 16m ago DB Firearms
UMC Rifle Ammo 300AAC Blackout, OTFB, 220Gr, 50Rnd, Boxed 047700490106 $3.63/rd $72.56 In Stock 14d ago 3m ago White Birch Armory
Lehigh Defense Maximum Expansion .300 Blackout 194 Grain 20/200 810025509835 $3.60/rd $71.99 In Stock 77d ago 27m ago Firearms Depot
LEHIGH MAX EXP 300BLK 194GR 20/200 20 Gauge rounds 810025509835 $3.60/rd $71.99 In Stock 52d ago 1h ago HD Tactical
Wilson Combat Lehigh Defense ME .300 AAC Blackout 194 Grain Boat Tail Hollow Point Brass Cased Rifle Ammo, 20 Rounds, LA300BLK-194-ME 810025509835 $3.56/rd $71.09 In Stock 3d ago 34m ago Optics Planet
UNDERWOOD AMMO .300AAC 194GR. SUBSONIC 20-PACK 816874022570 $3.44/rd $68.85 In Stock 3d ago 59s ago BattleHawk Armory
Underwood 300 AAC Blackout Ammunition UW452 194 Grain Maximum Expansion 20 Rounds 816874022570 $3.40/rd $67.99 In Stock 171d ago 59m ago Outdoor Limited
Underwood 300 Aac 194gr - Subsonic 20rd 10bx/cs 816874022570 $3.33/rd $66.65 In Stock 14d ago 2h ago Tactical Surplus USA
Lehigh Defense Controlled Chaos Ammo .300 AAC Blackout 115gr CC 20 rounds 810025508494 $3.10/rd $62.10 In Stock 63d ago 25m ago Cheaper Than Dirt
UNDERWOOD 300 AAC 194GR 20 rounds 816874022570 $3.10/rd $61.99 In Stock 30d ago 1h ago HD Tactical
Underwood Ammo .300AAC 194Gr. Subsonic 20-Pack 452 816874022570 $3.08/rd $61.54 In Stock 3d ago 15m ago Foundry Outdoors
LEHIGH LA300BLK-115-CC 300BO 115 CNTRL CHAOS 20/10 810025508494 $3.05/rd $60.99 In Stock 73d ago 1h ago Gulf Coast Gun & Outdoors
Lehigh Defense Maximum Expansion Brass .300 AAC Blackout 194 Grain 20-Rounds BTHP 810025509835 $3.00/rd $60.09 In Stock 3d ago 44m ago GrabAGun.com
Underwood Ammo .300 Blackout Ammunition 20 Rounds Maximum Expansion 194 Gr Lead Free 816874022570 $3.00/rd $59.89 In Stock 49d ago 25m ago Cheaper Than Dirt
Black Hills Ammunition 300 Blackout 198gr Dual Performance Subsonic 1050 FPS 485 Ft/Lb Lead Free 20/box 612710136483 Free S/H over $250 $2.97/rd $59.37 In Stock 147d ago 1h ago AE Armory
Lehigh Max Exp 300blk 194gr 20/200 810025509835 $2.94/rd $58.79 In Stock 2d ago 2h ago Tactical Surplus USA
Lehigh Defense LA300BLK115CC Controlled Chaos 300 Blackout 115 gr 2350 fps Lehigh Defense Controlled Chaos 20 Bx/10 Cs 810025508494 $2.92/rd $58.49 In Stock 11d ago 11m ago Ammo Joy
Underwood Ammo .300 Blackout, 115gr, Controlled Chaos, 20rd Box 816874020811 $2.90/rd $58.09 In Stock 93d ago 16m ago Impact Guns
Underwood Ammunition 300 AAC Blackout 115 Grain Lehigh Controlled Chaos Lead-Free Box of 20 816874020811 $2.85/rd $56.99 In Stock 29d ago 1h ago MidwayUSA
Liberty Overwatch Ammunition 300 Blackout 96 Grain Fragmenting Hollow Point Lead Free Box of 20 691835874210 $2.80/rd $55.99 In Stock 29d ago 1h ago MidwayUSA
LEHIGH CTL CHAOS 300BLK 115GR 20/200 20 Gauge rounds 810025508494 $2.79/rd $55.84 In Stock 28d ago 16m ago DB Firearms
LEHIGH LA300BLK-115-CC 300BO 115 CNTRL CHAOS 20 Round Box 810025508494 $2.78/rd $55.67 In Stock 29d ago 45m ago Cape Gun Works
Premier Match 300 Blackout 125 Grain $2.70/rd $53.99 In Stock 10d ago 5m ago Remington Ammunition
Underwood Ammo .300 AAC Blackout 115 Grain Solid Monolithic Hollow Point Nickel Plated Brass Cased Rifle Ammo, 20 Rounds, 451 816874020811 $2.70/rd $53.99 In Stock 3d ago 34m ago Optics Planet
Wilson Combat LA300BLK115CC 20 rounds 810025508494 $2.68/rd $53.49 In Stock 99d ago 19m ago GunsInStock.com
Lehigh Controlled Chaos .300 AAC BLACKOUT, 115gr, CC - 20 Rounds [MPN: LA300BLK115CC] 810025508494 $2.68/rd $53.49 In Stock 63d ago 27m ago Firearms Depot
Wilson Combat LA300BLK115CC 20 rounds 810025508494 $2.68/rd $53.49 In Stock 123d ago 21m ago Griswald Defense
Wilson Combat LA300BLK115CC 20 rounds 810025508494 $2.68/rd $53.49 In Stock 106d ago 41m ago Hot Ammo
Wilson Combat LA300BLK115CC 20 rounds 810025508494 $2.68/rd $53.49 In Stock 44d ago 22m ago United Patriot Supply
Lehigh Defense Controlled Chaos 300 Blackout 115 gr Lehigh Defense Controlled Chaos 20 Per Box $2.68/rd $53.49 In Stock 4d ago 53m ago DEGUNS.NET
LEHIGH LA300BLK-115-CC 300BO 115 CNTRL CHAOS 20/10 810025508494 $2.68/rd $53.49 In Stock 16d ago 26m ago Beebe Family Arms & Munitions
LEHIGH LA300BLK-115-CC 300BO 115 CNTRL CHAOS 20/10 810025508494 $2.68/rd $53.49 In Stock 125d ago 20m ago Skogen’s Gun Supply
NovX Pentagon 300 AAC Blackout Ammunition 20 Rounds 125 Grain 850022779305 $2.66/rd $53.27 In Stock 19d ago 25m ago Cheaper Than Dirt
Federal PowerShok 300 Blackout, 120gr, Copper Soft Point, 20rd Box 604544627756 $2.61/rd $52.19 In Stock 57d ago 16m ago Impact Guns
Lehigh Defense CC Ammunition 300 AAC Blackout 115 Grain Controlled Chaos Lead Free Box of 20 810025508494 $2.60/rd $51.99 In Stock 27d ago 1h ago MidwayUSA
Lehigh Defense .300 Blackout 115 Grain Controlled Chaos Brass Cased Centerfire Rifle Ammo, 20 Rounds, LA300BLK115CC 810025508494 $2.60/rd $51.99 In Stock 3d ago 34m ago Optics Planet
LEHIGH DEFENSE 300 AAC Blackout 115gr Controlled Chaos Ammunition | 20 Rounds 810025508494 $2.60/rd $51.99 In Stock 44d ago 1h ago KyGunCo
LEHIGH CTL CHAOS 300BLK 115GR 20/200 20 Gauge rounds 810025508494 $2.60/rd $51.99 In Stock 52d ago 1h ago HD Tactical
LEHIGH LA300BLK-115-CC 300BO 115 CNTRL CHAOS 20/10 810025508494 $2.57/rd $51.38 In Stock 18d ago 60m ago SHTF Tactical

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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