.223 Remington Ammo

What is .223 Remington?

.223 Remington is a civilian centerfire rifle cartridge introduced by Remington in 1963. It was developed alongside what would become the military’s 5.56x45mm NATO round and shares nearly identical case dimensions — but they’re not interchangeable from a pressure and safety standpoint.

The .223 Rem is the most common commercial chambering in AR-15-platform rifles and a widely used bolt-action chambering for varmint hunting and precision shooting. It fires a .224-inch diameter bullet, the same as 5.56 NATO.

The chamber compatibility rules — read this

This is the most practically important thing to understand about .223 Remington:

The rule: A 5.56 chamber can fire .223 safely. A .223 chamber should not fire 5.56 NATO — the higher military pressure can cause unsafe headspace and overpressure. The Wylde chamber was designed specifically to handle both.

Check your barrel stamp. “5.56 NATO” or “.223 Wylde” means you can run either. “.223 Rem” means stick with .223.

In practice: most commercial “5.56” brass-case range ammo is loaded to .223 Rem pressure anyway. The issue is with true mil-spec pressure loads or surplus ammunition.

Twist rate and bullet weight

.223 Rem rifles use different twist rates depending on their intended purpose. Bullet stability requires matching twist rate to bullet weight:

Most modern AR-15s come with 1:8 or 1:7 twist. Dedicated varmint bolt-actions sometimes use 1:12 for maximum precision with light bullets. If you’re shooting 69–77gr match bullets, verify your barrel is at least 1:8.

Ballistics at range

From a 20” barrel, .223 Rem with common loads:

The 77gr OTM is slower at the muzzle but bucks wind better — at 400 yards in a 10 mph crosswind, it drifts ~1” less than a 55gr FMJ. At longer range, the higher-BC heavy bullets are meaningfully better.

Brand guide

Federal American Eagle 55gr FMJ — the brass-case range standard. Consistent, clean-burning, widely distributed. ~$0.24–0.35/rd.

Winchester USA 55gr FMJ — equivalent quality to AE, often priced similarly. Brass case, reliable. ~$0.23–0.33/rd.

Hornady V-MAX 55gr — the varmint benchmark. Polymer tip, explosive fragmentation on impact. ~$0.60–0.85/rd.

Federal Gold Medal 69gr Sierra SMK — the precision standard for .223 bolt-gun shooting. ~$1.00–1.40/rd.

Black Hills 77gr OTM — premium match load, what competitive precision AR shooters use. ~$1.20–1.60/rd.

Hornady ELD-Match 73gr — match-grade, good BC, consistent lot-to-lot. ~$1.00–1.40/rd.

Hornady TAP 55gr HP — defensive/LE load, controlled fragmentation, widely tested. ~$0.85–1.20/rd.

Tula 55gr FMJ (steel case) — cheapest range option. More carbon, not for all rifles. ~$0.18–0.25/rd.

Price guide (2025–2026)

Firearms chambered in .223 Remington

AR-15 platforms (dedicated .223 Rem chamber):

• Ruger AR-556 (some models specifically .223 Rem)
• Many budget-tier AR-15s ship with .223 Rem barrels

Bolt-action varmint/precision:

• Remington 700 Varmint, 700 SPS Varmint
• Savage 12 Varminter, Axis in .223
• Ruger American Predator (.223 Rem, also available in 5.56 Wylde)
• Tikka T3x Varmint
• Howa 1500 Varmint

Note: Most serious AR-15 builders spec 5.56 NATO or .223 Wylde chambers for maximum ammo compatibility. Pure .223 Rem chamberings are more common in bolt-actions than modern AR-15s.