Skip to content Skip to footer
Please to create posts and topics.

differance between 223 and 5.56

I am not new to reloading, been loading pistol for a couple years now.

Since I will be getting a rifle shortly, I have started my research on rifle reloading. I will be picking up a rifle chambered in 5.56.

I have started putting together my order list for the round. I don't see any listing for the 5.56. Everything I see is marked as 223/5.56. I am assuming that these 2 rounds are the same. With the little research I have completed at this time (still have alot to go before I attempt to reload this round) the 223/5.56 is basicly the same round. You can shoot a 223 out of a rifle chamber in 5.56 but not Vice-Versa.

Would it be safe to assume that the 5.56 case is a little stronger than the 223?

What is the real difference between these 2 rounds, case size, powder charge, etc.

 

Any additional info would be great.

 

 

Thanks

   Bryan

The most significant difference between .223 and 5.56mm is the throat of the chamber. On 5.56mm, the throat is longer, allowing ammo to be loaded at higher pressure than in commercial .223. Load data from a reloaders perspective is generally unchanged. The main issue is NOT to fire military 5.56mm ammunition in a .223 Remington chamber.

As the 556 case is milspec it is generally stronger. I have not had an issue with either 223 or 556 cases.
I do recommend  that you use a spray lube for simplicity and speed. I have used pads and spray lube and far prefer the spray.

By Reloaders, For Reloaders.

Reloader.com © 2026. All rights reserved.

Go to Top
E-mail
Password
Confirm Password