Blackout Ammunition .300 Blackout 125gr Sierra MatchKing, 160 Round Bucket

Blackout Ammunition .300 Blackout 125gr Sierra MatchKing, 160 Round Bucket is stocked here in its 300 Blackout chambering. The detail below is what actually matters when you are choosing between loads.

Specifications

Cartridge	300 Blackout
Bullet weight	125 grain
Projectile	Match Hollow Point Boat Tail
Bullet diameter	.308
Typical muzzle velocity	1,000 fps subsonic, 2,100 to 2,300 fps supersonic
Usual twist rate	1:7 to 1:8
Platform	AR-15
Rounds per pack	160
SKU	GA300125SMKB
Price	$224.99
Cost per round	$1.406

Projectile construction

This is a a target design chosen for consistency rather than terminal effect. The hollow point is a manufacturing artefact of the jacket drawing process, not an expansion mechanism, so it should not be selected as a hunting bullet.

Bullet weight and bullet construction get conflated constantly. Weight sets trajectory and momentum; construction sets what happens on impact.

Working with 300 BLACKOUT

Full powder burn by roughly 9 inches, which is why it dominates short barrel builds.

Muzzle velocity for 300 Blackout typically runs 1,000 fps subsonic, 2,100 to 2,300 fps supersonic, from a AR-15 platform with a 1:7 to 1:8 twist. Treat any published velocity as indicative. Your barrel will give you a different number, and that number is the one that matters.

Where this weight sits

At 125 grain this is on the lighter side for 300 Blackout. Lighter bullets leave the muzzle faster and shoot flatter, which helps on smaller targets and at distance, but they bleed velocity sooner and depend more on impact speed to do their job.

Cost per round

160 rounds at $224.99 works out at $1.406 per round. Bulk packaging like this is how you keep a rifle you shoot regularly fed without the per round cost climbing.

Shipping and legal notes

Ammunition ships within the United States subject to state and municipal restriction. Some jurisdictions require licensing or prohibit delivery outright, and buyers must meet age and eligibility requirements where they live. See our shipping and delivery page for the current detail.

Is this the right load for you

Match the load to the job rather than the price. This is a target and load development projectile. It is not a hunting bullet, and choosing it for game is the single most common mistake with this bullet line.

Barrel length matters

Do not assume box velocity applies to your barrel. Published figures usually come from long test barrels, and real rifles run slower. For 300 Blackout specifically, expect 1,000 fps subsonic, 2,100 to 2,300 fps supersonic as the published band and treat your own chronograph as the authority.

How to store this

Storage is simple: stable temperature, low humidity, original packaging where possible. Attics and car boots are the two places that quietly ruin ammunition.

Browse more

Browse our 300 Blackout ammunition for other weights and projectile types, or run your setup through the ballistics calculator.

300 Blackout against the alternatives

Against 5.56 it gives up range and gains suppressed performance and short barrel efficiency. Against 8.6 Blackout it gives up roughly half the subsonic energy and gains an AR-15 platform and far cheaper ammunition.

Pick the cartridge that fits the shooting you actually do, not the shooting you read about.

Stock and handling

This is genuine factory ammunition, held in a climate stable stockroom rather than a container. Orders are picked from sealed cases and packed so nothing shifts in transit.

New to this cartridge? Start with a single box. Barrel to barrel variation is real, and the only way to know how a load performs in your rifle is to shoot it.

Frequently asked questions

What platform suits 300 Blackout?

A AR-15 with a 1:7 to 1:8 twist is the usual setup. Full powder burn by roughly 9 inches, which is why it dominates short barrel builds.

Is the published 300 Blackout velocity accurate?

It is indicative. Expect 1,000 fps subsonic, 2,100 to 2,300 fps supersonic as a range, and verify with a chronograph.

Is the match hollow point boat tail projectile suitable for what I am shooting?

It is a a target design chosen for consistency rather than terminal effect. The hollow point is a manufacturing artefact of the jacket drawing process, not an expansion mechanism, so it should not be selected as a hunting bullet. Match that against your intended use before buying.

Why choose 125 grain?

Weight sets the trade between velocity and momentum. 125 grain is one point on that curve; the right pick depends on your barrel, your distance and your target rather than on the number itself.

What is in the pack?

160 rounds at $224.99, which is $1.406 per round.

Do you actually have this in stock?

Yes, this is held stock rather than drop shipped, and the listing comes down when it sells out.

What are the delivery restrictions?

They vary by state and sometimes by city, ranging from licensing requirements to outright prohibition. See the shipping page.

How should I compare loads?

Compare cost per round rather than box price, and compare projectile construction rather than grain weight. Those two habits will steer you right more often than brand loyalty.

Do you sell components for this cartridge?

We stock projectiles and brass for several of our calibres alongside loaded ammunition. Check the projectiles and brass category for what is currently available.

Do you sell remanufactured ammunition?

No. Everything listed is sealed factory ammunition.