Top 5 Subsonic 300 Blackout Ammo

When shooting your 300 blackout suppressed you'll likely want to use subsonic ammo to make the gun quieter. Subsonic 300 Blackout has some of the best terminal ballistics of any subsonic round. With bullet weights in the 190-220 grain range, and a muzzle velocity below 1,100 FPS, 300 Blackout is one of the best cartridges for shooting subsonic rounds. This list is our best 300 Blackout Subsonic ammo, you can check out all subsonic 300 Blackout ammo here.

Winchester USA Ammunition 300 AAC Blackout Subsonic 200 Grain Open Tip Range

Winchester USA ammunition was developed to provide excellent performance at an affordable price for the high volume shooter. Featuring high quality Winchester components, this ammunition delivers outstanding reliability. This ammunition is loaded with a full metal jacket bullet which is known for its positive functioning and exceptional accuracy. On impact this bullet does not expand and is ideal for target shooting. This ammunition is new production, non-corrosive, in reloadable brass cases.

What Customers Are Saying


Perfect for target shooting. For the time that comes where we have to shoot down balloons from the sky.
- Shooting Down Balloons, 2/5/2023

About Winchester

Winchester is The American Legend, a brand built on integrity, hard work, and a deep focus on its loyal Customers. Considered one of the world’s leading ammunition and firearms manufacturers, Winchester has built its reputation on delivering innovative products, providing top-shelf Customer service, and demonstrating industry leadership. Along with ammunition and firearms, Winchester offers many gun parts and accessories as well as tools, apparel, safes and storage, air guns, and more. We offer a huge selection of Winchester products, including the Model 70 Rifle, Super-X Ammunition, SX4 Shotgun, and AA Target Ammo. From our research and development efforts to our manufacturing processes, we understand the value of product quality and performance. With a reputation steeped in tradition, we have earned the moniker ‘The American Legend’ by delivering on our commitment to excellence in everything we do.

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Barnes Precision Match Ammunition 300 AAC Blackout Subsonic 220 Grain Sierra MatchKing Open Tip Match Box of 20

Barnes Precision Match ammunition, engineered for precision at extreme distances, features exceptionally low standard deviations and extreme variations due to Barnes’ exacting manufacturing and quality standards. Precision Match rounds are loaded with a Sierra Matchking projectile featuring a long boat tail and high B.C. As an additional bonus, scan the QR code located on the back of each box to view Doppler radar generated drop tables specific to each load.


Sierra MatchKing bullets have very thin jackets and are held to exacting tolerances in diameter and weight. These Open Tip Boat Tail bullets have a small meplat to produce a higher ballistic coefficient. Their accuracy has been acclaimed worldwide and they have been used to win more target competitions than all target bullets from other manufacturers combined. The 30 caliber MatchKing is widely respected as one of the most accurate bullets available. It has been used to win countless championships and set numerous world records in various long range shooting competitions.


As a proud supplier of precision ammunition to America’s Military Elite, Barnes makes top tier ammunition commercially available for the elite, technical shooter who demands uncompromising performance. Precision Match Ammunition delivers exceptionally accurate, long range allowing the shooter to send it with confidence every time. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.

What Customers Are Saying

Great ammo!

I didn't check velocity readings, but all were subsonic. I had no primer, feeding, or extraction issues with all 20 shots. Using Ballistic Advantage 8" 1:7 barrel, direct thread suppressor, and tuned gas with an Aero Precision 0.75" Adjustable Gas Block. Consistent OAL and brass CBO. Clean shooting and brass after ejection. Same POI as my reloaded 1050fps 220gr Sierra ammo. 0.50" groups at 50 yards and just over 1" at 100. 1.5"-2" bullet drop from 50-100. Couldn't be happier with factory plinking ammo just wish they were cheaper.
- Caleb, 4/23/2023

About Barnes

Barnes Bullets was founded in 1932 by Fred Barnes in Bayfield, CO. After 42 years in business, Fred sold Barnes Bullets to passionate hunters Randy and Coni Brooks who moved the business to American Fork, Utah. Randy and Coni were hunting brown bears in Alaska during the fall of 1985 when Randy conceived the idea of an expanding copper bullet. This prototype became the X Bullet, and its lineage continues today through five generations of improvement to the TSX, Tipped TSX, and LRX bullets you see today. Barnes Bullets produces a wide variety of components for the handloader, including lead-free and traditional lead-core bullets. Barnes also makes lead-free bullets specifically for muzzleloader hunting, in both hollow point and polymer-tipped versions. MidwayUSA also offers a comprehensive line of Barnes-manufactured ammunition including the popular VOR-TX product line.

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Hornady BLACK Ammunition 300 AAC Blackout Subsonic 208 Grain A-MAX Box of 20

Hornady BLACK ammunition features versatile loads optimized for excellent performance from America’s favorite guns. Loaded with legendary Hornady bullets, Hornady BLACK ammunition is designed to fit, feed and function in a variety of platforms. Direct impingement, gas piston, suppressed, unsuppressed, inertia, bolt, pump, supersonic, subsonic, rifle, mid-length, carbine or pistol – Hornady BLACK ammunition delivers superior performance for a variety of applications. 


  • High Quality Cases, Primers and Propellant
  • Versatile Hornady bullet options
  • Optimized performance from various platforms

What Customers Are Saying

Accurate Round

I use this mainly for target shooting and it works extremely well in my 8 inch suppressed 300blk. Its the most accurate round Ive tested and I am routinely getting 1 inch groups at 100 yards subsonic and suppressed. Im impressed.
- Alabama Matt, 1/25/2017

About Hornady

“Ten bullets through one hole” is the philosophy that brought Hornady® Manufacturing from a two-man operation in 1949, to a world-leading innovator of bullet, ammunition, reloading tool and accessory design and manufacture today. Change is their constant and daily challenge. They outperform their competitors by ensuring the products they make are the ones their customers need right now, and accurately predict what they’ll want in the future. They recognize trends, and respect when to leave well enough alone. Their workforce includes an ample number of hunters and competitive shooters, as well as veterans and former law enforcement officers. At Hornady® Manufacturing, ammunition is more than their livelihood. It’s a major part of their daily life.

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Stelth Ammunition 300 AAC Blackout 220 Grain Total Metal Jacket

Ammo Inc. 300 Blackout is the perfect ammo for your next trip to the range. You will not find a higher quality, better performing line of rifle ammo than the Signature Ammo, Inc. rifle line. Balancing velocity, accuracy, and recoil, the development team at Ammo, inc carefully analyzes every load to help ballisticians achieve the specific outcome of superiority. This ammunition is new production in reloadable brass cases.



  • Flawless Cycling and Superior Shooting
  • Hyperclean Technology - Shoot more, Clean less
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Nosler Match Grade Ammunition 300 AAC Blackout Subsonic 220 Grain Custom Competition Hollow Point Boat Tail Box of 20

Nosler Custom Match Grade ammunition is loaded with the highest quality components to deliver accuracy that will rival or even surpass similar handloads. Each powder charge is meticulously weight-sorted to provide consistent measurements and capacities for accurate loads. Nosler Match Grade ammunition uses Nosler Custom Brass which features a Nosler head-stamp, chamfered and deburred case mouth, deburred flash hole, consistent trimmed length, and consistent neck wall thickness.

Custom Competition bullets blend match winning accuracy and consistency with maximum value for performance-minded shooters. Highly concentric jackets, ultra precise lead alloy cores and hand inspected quality offer competitive shooters more, for less. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.

What Customers Are Saying

Excellent deer hunting round.

While I was Leary about trying this round on deer. My thoughts were soon dispelled. This 220 grain mostly copper to lead was a one shot one kill round. I knew the 110 grain was great but to me the 220 grain, while being a tad slower, did an excellent job of penetration and clean kill.
- Larry J. Gauthier, 2/18/2018

About Nosler

In 1946, John Amos Nosler was hunting moose in British Columbia. The bullets he was using failed to penetrate deeply enough for a fast kill. This flaw inspired Nosler to develop a new bullet design, one that would not only expand at low velocities but also be robust enough for high-velocity impacts and deep penetration. Two years later, the Nosler Partition Bullet Company was formed in Oregon to sell the new Partition bullets. MidwayUSA offers a complete line of Nosler bullets, ammo, and brass including Assured Stopping Power (ASP), Ballistic Tip, Defense Handgun, Expansion Tip Lead-Free, Match Grade, Trophy Grade, Trophy Grade Long Range, Varmageddon, Accumbond, Accubond Long Range, Combined Technology Ballistic Silvertip, Custom Competition Match, Partition, Reduced Drag Factor (RDF), Solid Dangerous Game. Nosler Model 48 and Model 21 rifles are also offered in popular calibers to suit the needs of premium hunters. Shoot with confidence knowing at Nosler it’s always “Quality First”.

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