Blackout Ammunition .223 REM 55gr Sierra Blitzking©, 20 Round Box

Blackout Ammunition .223 REM 55gr Sierra Blitzking©, 20 Round Box is stocked here in its .223 Remington chambering. The detail below is what actually matters when you are choosing between loads.

Specifications

Cartridge	.223 Remington
Bullet weight	55 grain
Projectile	Polymer Tipped Varmint
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	GA22355SBK
Price	$29.99
Cost per round	$1.499

Also in .223 / 5.56: Blackout Ammunition .223 REM 69gr Sierra Matchking©, 20 Round Box, Blackout Ammunition .223 REM 69gr Sierra Matchking©, 150 Round Bucket and Blackout Ammunition COSMETIC BLEM .223 Rem 77gr Sierra MatchKing©, 20 Round Box.

Terminal behaviour of the polymer tipped varmint design

This is a built for violent, rapid expansion on light game, with a polymer tip that raises ballistic coefficient and starts expansion immediately. Not a deep penetrator, and not intended to be.

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.

Working with .223 REM

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. Treat any published velocity as indicative. Your barrel will give you a different number, and that number is the one that matters.

Choosing this bullet weight

At 55 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 and cost per round

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 suits small game and pest control where rapid energy transfer matters and over-penetration is a hazard. It is the wrong choice for large game.

What your barrel does to these numbers

Barrel length changes the numbers. Short barrels give up velocity that light bullets in particular depend on, so a load that performs from 20 inches may disappoint from 16. 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.

Related ammunition

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.

Cartridge arguments usually come down to people optimising for different things without saying so. Decide what you are optimising for first.

Stock and handling

Every load leaving here is factory ammunition from the manufacturer, not repackaged or remanufactured stock. Lots are stored indoors at stable temperature and packed so bullet tips are not knocking against each other in transit.

If this is your first purchase in this calibre, buy one box before you buy ten. Rifles are individual, and a load that groups beautifully in one barrel can string in another for no obvious reason.

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.

Is the published .223 Remington velocity accurate?

It is indicative. Expect 2,700 to 3,240 fps depending on bullet weight and barrel as a range, and verify with a chronograph.

Is the polymer tipped varmint projectile suitable for what I am shooting?

It is a built for violent, rapid expansion on light game, with a polymer tip that raises ballistic coefficient and starts expansion immediately. Not a deep penetrator, and not intended to be. Match that against your intended use before buying.

Why choose 55 grain?

Weight sets the trade between velocity and momentum. 55 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.