223 vs 556: Key Differences in Ballistics, Pressure, and Price (2025 Guide)

When it comes to AR-style rifles, the choice between 223 Remington and 5.56 NATO isn’t just about numbers. The difference can affect accuracy, safety, cost, and performance — and knowing which one to load could make or break your next range day

223 vs 556 — what’s the real difference? Many shooters compare 5.56 vs 223 and wonder which is better for accuracy, safety, and cost. The difference between 223 and 5.56 can be subtle to the eye, but it impacts performance, compatibility, and even your rifle’s lifespan.

Whether you’re target shooting, hunting, or running tactical drills, this guide breaks down 5.56 vs .223 with ballistics data, chamber pressure comparisons, price breakdowns, and tips for choosing the right round — plus where to find the best deals on bulk ammo.

5.56 vs 223 – The Key Differences

At first glance, 5.56 NATO and .223 Remington look almost identical, sharing case dimensions, bullet diameter, and shape. The real difference is inside the case — pressure and performance.

• 5.56 NATO – Runs hotter, with higher pressure (~58,000 PSI), more velocity, and more energy on impact.
• .223 Remington – Operates at lower pressure (~55,000 PSI), making it easier on barrels and components.

This higher pressure in 5.56 vs .223 means more speed and power per shot, but also more wear if used in rifles not designed for it.

Case Structure & Ballistics

The physical build of the cases varies slightly:

• 5.56 brass is thicker for added durability, which slightly reduces internal case volume and changes how powder burns.
• .223 brass has more internal capacity, altering ballistics just enough to matter for precision shooters.

When comparing 5.56 vs 223 ballistics, 5.56 often delivers higher muzzle velocity, while .223 tends to produce tighter groupings for long-range accuracy.

Can You Shoot 5.56 in a 223 Rifle?

A common misconception is that 5.56 NATO and .223 Remington are interchangeable. They’re not.

• .223 Chamber – Designed for lower pressure; firing 5.56 in a .223 chamber can cause excessive pressure buildup, risking damage or even catastrophic failure.
• 5.56 Chamber – Can safely fire both 5.56 and .223.

Tip: The .223 Wylde chamber is a hybrid design that safely handles both rounds while maintaining the accuracy benefits of .223.

223 vs 556 Price Comparison

Price is one of the most searched questions for these calibers. In general:

• .223 Remington is cheaper and more widely available.
• 5.56 NATO can be more expensive due to demand in tactical and military-style shooting.

Buying in bulk lowers the cost per round for both calibers. Ammo2Burn offers bulk 223 and bulk 5.56 deals with competitive pricing and free shipping on qualifying orders.

5.56 NATO vs .223 Remington for Hunting

• Best 223 Ammo for Hunting – Controlled expansion for small to medium game, precision accuracy, and lower recoil.
• 5.56 for Hunting – Delivers higher velocity and energy, better for long-range varmint control or defensive use.

For most hunters, .223 Remington offers better shot placement and less meat damage, while 5.56 is ideal for situations where speed and stopping power matter most.

223 vs 5.56 for Self-Defense & Tactical Use

• 5.56 NATO – Preferred in military and law enforcement for penetration, speed, and reliability under pressure.
• .223 Remington – Lower recoil makes it easier to maintain accuracy in follow-up shots.

Bulk Ammo Deals for 223 & 5.56

Stocking up on the right ammo can save you money and keep you ready for the range, hunting season, or emergencies.

• [Shop Bulk 223 Ammo] – Affordable, accurate, and versatile.
• [Shop Bulk 5.56 Ammo] – Tactical performance and high velocity.

FAQs – Everything You Need to Know About 5.56 vs 223

What’s the difference between 223 and 5.56?

Pressure, chamber design, and case thickness — 5.56 runs hotter and needs the right chamber.

Can I shoot 5.56 in a 223 rifle?

No — it can cause dangerous pressure buildup.

Can I shoot 223 in a 5.56 rifle?

Yes — perfectly safe, though you may see slight performance changes.

What is a .223 Wylde chamber?

A hybrid chamber designed to handle both calibers safely with high accuracy.

Which is cheaper — 223 or 5.56?

.223 is generally more affordable and easier to find in bulk.

Ready to stock up? Click here to shop the best deals on bulk 223 and 5.56 ammo — and get free shipping over $200