Blackout Ammunition .223 Rem 77gr Sierra MatchKing©, 20 Round Box

This listing covers the Blackout Ammunition .223 Rem 77gr Sierra MatchKing©, 20 Round Box. Rather than repeat the box copy, the sections below set out what the projectile does and where .223 Remington fits.

Specifications

Cartridge	.223 Remington
Bullet weight	77 grain
Projectile	Match Hollow Point Boat Tail
Bullet diameter	.224
Typical muzzle velocity	2,700 to 3,240 fps depending on bullet weight and barrel
Usual twist rate	1:7 to 1:9
Platform	AR-15
Rounds per pack	20
SKU	GA22377SMK
Price	$29.99
Cost per round	$1.499

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.

Construction decides terminal behaviour far more than weight does. Two loads of the same grain weight with different jackets do completely different things at the target.

What .223 REM is good at

Light-for-calibre bullets rely on velocity rather than mass, so barrel length matters more here than in most cartridges.

Muzzle velocity for .223 Remington typically runs 2,700 to 3,240 fps depending on bullet weight and barrel, from a AR-15 platform with a 1:7 to 1:9 twist. Barrel length, lot and temperature all move that figure, so verify it in your own rifle rather than relying on the box.

Choosing this bullet weight

At 77 grain this is on the lighter side for .223 Remington. 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.

Pack size

20 rounds at $29.99 works out at $1.499 per round. A box this size suits load development, hunting stock and defensive carry rather than high volume practice.

Ordering and compliance

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.

Intended use

Before buying, be honest about the use case. 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 and velocity

Velocity scales with barrel length, and the effect is largest on lighter, faster bullets. Check what your own barrel actually delivers. For .223 Remington specifically, expect 2,700 to 3,240 fps depending on bullet weight and barrel as the published band and treat your own chronograph as the authority.

Storage notes

Keep cartridges cool, dry and at stable temperature. Heat cycling in a garage or vehicle does more damage over time than age does, and factory packaging protects bullet tips from knocking together.

Browse more

Browse .223 and 5.56 ammunition for other weights and projectile types, or run your setup through the ballistics calculator.

Choosing .223 Remington over something else

Against 5.56 NATO it is the lower pressure sibling, and against 6mm ARC or 6.5 Grendel it gives up downrange energy in exchange for cheaper ammunition and far wider availability.

None of that makes one cartridge better in the abstract. It makes them better at different jobs, and the job is yours to define.

How this is stored

We stock factory loaded ammunition only, no remanufactured or reloaded product. Stock is stored indoors, rotated oldest first, and packed to keep projectiles protected on the way to you.

A word if you are stocking up: test before you commit. Buying a case of a load your rifle dislikes is an expensive way to learn about harmonics.

Frequently asked questions

Which twist rate does .223 Remington need?

1:7 to 1:9 is standard. Light-for-calibre bullets rely on velocity rather than mass, so barrel length matters more here than in most cartridges.

How fast does .223 Remington run?

Around 2,700 to 3,240 fps depending on bullet weight and barrel at the muzzle, though your barrel will give you its own number.

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 77 grain?

Weight sets the trade between velocity and momentum. 77 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?

20 rounds at $29.99, which is $1.499 per round.

How quickly does this ship?

It is in stock and ships from the United States. Processing times and carrier detail are on the shipping page.

What are the delivery restrictions?

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

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 offer bulk pricing?

Larger pack sizes carry a lower cost per round, which is listed on each product page so you can compare directly rather than doing the arithmetic yourself.

Do you sell remanufactured ammunition?

No. Everything listed is sealed factory ammunition.