300 AAC Blackout Ammo For Sale | Subsonic & Supersonic | Trigger Ammo Store

Buy 300 AAC Blackout Ammo Online

The 300 AAC Blackout — often shortened to 300 BLK — has become one of the
most popular AR-15 cartridges in America, and for good reason. It was
purpose-built to deliver serious power from short barrels, run quietly with
a suppressor, and work in a standard AR-15 with nothing more than a barrel
swap. At Trigger Ammo Store, we carry a deep selection of 300 Blackout
ammunition so you can match the load to your mission, whether that’s quiet
backyard plinking, hog hunting, or home defense.

What Is 300 AAC Blackout?

Developed by Advanced Armament Corporation and standardized in 2011, the
300 Blackout was designed around the 5.56 NATO case, shortened and necked up
to fire a .30-caliber bullet. The genius of the design is compatibility:
300 BLK runs in a standard AR-15 lower, bolt, and magazines — you only need
a 300 Blackout barrel. That made it an instant favorite for shooters who
already own an AR platform and want .30-caliber performance and suppressor
friendliness without a whole new rifle.

Subsonic vs. Supersonic 300 Blackout Ammo

The cartridge’s biggest strength is its dual personality. Understanding
the two categories is the key to buying the right ammo:

Subsonic 300 Blackout (typically 190–220 grain):
These heavy bullets travel below the speed of sound, which means no sonic
crack. Paired with a suppressor, subsonic 300 BLK is famously quiet —
ideal for suppressed shooting, low-noise practice, and discreet hunting.
Supersonic 300 Blackout (typically 110–135 grain):
Lighter, faster rounds that deliver flatter trajectories and more energy
on target. Supersonic loads are the go-to for hunting, defense, and
general range use where ballistic performance matters most.

Types of 300 BLK Ammo We Carry

Full Metal Jacket (FMJ): Affordable supersonic rounds
for high-volume range and training days.
Open Tip / Hollow Point & Hunting Loads:
Controlled-expansion bullets for hogs, deer, and predators.
Subsonic / Suppressor Loads: Heavy-for-caliber bullets
optimized to cycle quietly through a suppressed AR.
Match & Specialty: Precision loads for shooters
who want consistency downrange.

What Is 300 Blackout Good For?

300 BLK shines in short-barreled and suppressed setups where 5.56 loses
efficiency. Common uses include suppressed range shooting, home defense with
a compact AR pistol or SBR, and hunting medium game and hogs at moderate
ranges. Its full-power performance out of barrels as short as 9 inches is a
big part of why it has stayed popular.

Top 300 AAC Blackout Ammo Brands

We stock 300 Blackout ammunition from manufacturers shooters trust,
including Hornady, Barnes, Sig Sauer, Federal, Remington, Winchester, Magtech,
and Sellier & Bellot. From premium hunting and subsonic suppressor loads
to value-priced bulk FMJ, you’ll find the right balance of price and
performance.

Bulk 300 Blackout Ammo & Best Prices

Feeding an AR adds up fast. Buying 300 BLK ammo in bulk lowers your cost
per round and keeps you stocked for range trips and training. Browse our bulk
listings for case-quantity pricing, and keep an eye on stock alerts for
popular subsonic loads, which tend to sell out quickly.

A Safety Note on 300 BLK and 5.56

Because 300 Blackout uses 5.56-pattern magazines, a 300 BLK round can fit
in a 5.56 chamber — and firing one there is dangerous. Always keep your 300
Blackout and 5.56 ammo clearly separated and never mix magazines between
rifles. Confirm your firearm is chambered in 300 AAC Blackout before loading.

Fast, Reliable Shipping

Orders ship quickly with secure, age-verified delivery in compliance with
all applicable federal, state, and local laws. By placing an order you confirm
you are at least 18 years of age (21+ where required) and that it is legal for
you to purchase and receive rifle ammunition at your delivery address. Some
states and localities restrict ammunition shipments — please review your local
regulations before ordering.