300 BLACKOUT AND BULK 300 BLACKOUT AMMO

About 300 Blackout Ammo

Developed by Advanced Armament Corporation (AAC) and Remington Defense, .300 AAC Blackout (or .300 BLK) was officially introduced in 2011 to meet the growing demand for a .30 caliber cartridge compatible with the AR-15 platform.

Designed to outperform 5.56 NATO rounds in suppressed and short-barrel rifles, the 300 Blackout offers an ideal mix of power, versatility, and adaptability—all while using standard AR-15 magazines and components (only the barrel needs to be changed).

By repurposing .223/5.56 NATO brass and expanding it to accept a .30 caliber bullet, the 300 BLK delivers reliable cycling and excellent ballistic performance.

Whether you’re running supersonic rounds for long-range accuracy or subsonic ammo for stealthy suppressed shooting, .300 Blackout adapts to your mission.

From home defense and tactical use to hunting and recreational shooting, this innovative cartridge has become a favorite among civilian shooters, law enforcement, and military operators alike.

Common Names for 300 Blackout Ammo

Over time, .300 Blackout has become known by several different names. No matter the variation, they all refer to the same powerful and versatile rifle cartridge:

• 300 Blackout
• 300 BLK
• 300 AAC
• 300 AAC Blackout
• 300 Blackout Ammunition
• 300 AAC Ammunition
• 7.62x35mm

300 Blackout Ammo Features

Versatility
300 BLK is compatible with a variety of firearm types, including AR-15s, bolt-action rifles, and even AR-style pistols. It uses standard 5.56 AR lowers and magazines, making caliber conversions simple and cost-effective.

Stopping Power
Firing larger, heavier bullets than 5.56, .300 Blackout provides enhanced kinetic energy, making it ideal for medium game hunting and personal defense.

Ballistics
With a flat trajectory and excellent accuracy at mid-range distances, 300 BLK delivers consistent performance across multiple shooting disciplines.

Suppressor-Ready
Designed with suppressed shooting in mind, 300 Blackout excels with subsonic loads, providing quiet, recoil-controlled performance ideal for tactical and home defense use.

Supersonic & Subsonic Options
Switch effortlessly between fast, flat-shooting supersonic rounds and quiet, heavy subsonic ammo depending on your needs—all without changing your magazine or bolt.

Availability
Though slightly more expensive than 5.56, .300 Blackout is widely manufactured, available in various grain weights and bullet styles for hunting, defense, training, and more.

300 Blackout Benefits

If you're already running an AR-15, 300 Blackout is one of the easiest and most impactful upgrades you can make. All you need is a new barrel—the lower receiver, magazines, and bolt all stay the same.

Here’s why shooters love it:

Superior barrel efficiency
Designed to burn powder fully in shorter barrels, making it ideal for SBRs and AR pistols.

Heavier projectiles
Offers more energy on target than 5.56, especially at close-to-mid range.

Subsonic capabilities
Great for suppressor use, home defense, or tactical training with reduced noise.

No extra accessories needed
Standard AR-15 components and mags work perfectly with .300 BLK.

Hunting capable
With proper loads, it’s effective on hog, deer, and other medium-sized game.

Widely supported
Ammunition is mass-produced, with options ranging from FMJ range ammo to match-grade and expanding hunting rounds.of the .300 Blackout