Blackout Ammunition .223 REM 69gr Sierra Matchking© – 20 Round Box

The .223 pairs the .223 cartridge with a 69gr Sierra MatchKing projectile in a dependable supersonic load. Genuine, in-stock and ready to ship, this .223 is built to deliver consistent, reliable results from your rifle every time you pull the trigger.

Specifications

Caliber	.223
Bullet weight	69gr
Projectile	Sierra MatchKing
Type	Supersonic
Case	Factory-new brass
Quantity	20-round box

The Sierra MatchKing bullet

At the heart of this .223 is the Sierra MatchKing, chosen to match the supersonic role this load is built for. It is loaded on factory-new brass to consistent tolerances, the foundation of both reliability and accuracy.

That round-to-round consistency is what lets the load shoot to the same point of impact shot after shot — exactly what you want whether you are hunting, training or competing.

Supersonic performance and reach

This .223 runs supersonic for a flatter trajectory and more retained energy downrange, extending your practical range. You trade the whisper-quiet subsonic signature for velocity and on-target authority.

It is a strong choice when reach, speed and energy matter more than maximum quiet, and it performs from the short barrels the cartridge was built around.

What it is best for

This .223 suits hunting, defense and general-purpose shooting at supersonic ranges. Match the load to your task, confirm your zero before you rely on it, and it rewards you with dependable performance.

Different loads print to different points of impact, so always verify your zero with this specific round. For help choosing, read our 300 Blackout vs 5.56 guide.

Why buy from Blackout Ammunition

We stock genuine, in-stock .223 ammunition and ship fast to lawful destinations nationwide. Every order is handled by people who know the cartridge, so if you are unsure which load fits your build, just ask. Browse the full our full catalog lineup, review our shipping & delivery details and the FAQ, and find suppressors and components at our sister store, blackoutammo.shop.

About the .223 platform

The .223 chambering is a proven, widely supported choice with a deep ecosystem of ammunition, components and accessories. Building or feeding a .223 rifle means you have plenty of quality options to dial in exactly the performance you want.

This .223 is built to serve that platform reliably, whether you are completing a new build or upgrading an existing setup.

Storage and getting the most from it

Like all quality ammunition, this .223 keeps for years when stored cool, dry and stable, away from heat and humidity. Before you rely on it, put a few rounds downrange to confirm your zero and grouping in your specific rifle.

A little range time up front turns this load into one you can trust completely when it matters most.

Fast shipping and ordering

We ship most in-stock orders quickly and securely to lawful destinations across the United States, with tracking so you know where your order is. Ordering the .223 is straightforward, and our team is available if you need help before or after your purchase.

Review our shipping and delivery details for timelines and any state or item-specific requirements before you order.

Genuine products, real support

When you buy the .223 from Blackout Ammunition, you get a genuine product handled by people who actually know the platform — not a faceless warehouse. We stand behind what we sell and are here to help you build and shoot with confidence.

Have a question first? Our FAQ covers the common ones, and you can always reach out for personal guidance.

Explore related products and guides

Looking for more? Browse our full catalog for matching ammunition, suppressors and components, and read our 300 Blackout vs 5.56 guide to dial in your setup. Whatever you are building, you will find genuine, in-stock gear and the knowledge to use it well.

Questions about the .223 or your build? Reach out and our team will help you choose with confidence.

Frequently asked questions

Is this .223 subsonic or supersonic?

It is a supersonic load — flatter-shooting with more reach.

What rifle does this .223 work in?

Any properly chambered .223 rifle.

Can I shoot it suppressed?

Yes, though as a supersonic load it still produces a sonic crack.

How many rounds per box?

20 rounds per box.

Is it genuine, in-stock ammunition?

Yes — genuine and ready to ship to lawful destinations.

You must be 21 or older to purchase rifle ammunition. All ammunition ships via ground to lawful destinations only; it is the buyer’s responsibility to comply with all federal, state and local laws.