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.223 - 5.56 nato


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Old 02-25-2013, 05:55 PM   #11
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Quote:
Originally Posted by rjd3282 View Post
Go back and read my post. If you can find anything I said that isn't true let me know. I'm not anybody's mother let them make up their own minds about things. How would I be responsible for what other people do. It's funny, when I go to the reloading manuals there is no distinction between the two. You can't buy 5.56 dies, you can't buy 5.56 bullets it's all labeled 223 Remington, or .224 bullets. If you are going to talk about things like penetrators or tracers then be specific. I never mentioned either.

Chamber lengths aside the actually round itself is the same length for a given bullet weight. I never said there was no difference in chambers I said there is no difference in the ammo.
I am not arguing about the cartridge as they are virtually identical. I use military brass for reloading and have experienced no problems. There might be differences from different mfg or runs but it is generally negligible. However the factory loads for 223 and 5.56 are different with the 5.56 being loaded to a higher pressure and special purpose bullets in some cases. There is a definite danger in using factory 5.56 in a 223 chamber especially if you dont know what bullet it is loaded with.
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Old 02-26-2013, 11:36 PM   #12
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Originally Posted by rjd3282 View Post
There are those that say you can't shoot 5.56 from a 223 chamber. Personally I haven't had anyone explain it to me that makes sense. Some say 5.56 is loaded hotter than 223 but if you look you can find 223 ammo that is faster than 5.56 ammo with the same bullet. Only one way to do that and that's add more powder/pressure. Dimensionally it is the same ammo. Then there are some that say 5.56 uses thicker brass but after extensive testing myself, the two cases weigh exactly the same. Both hold the same amount of water. Then there's the people that say the 223 chamber has a shorter throat and it causes the 5.56 ammo to spike pressures. Again demsionally the same so if it doesn't spike with 223 ammo I don't know how it will spike with 5.56. Also many reloaders adjust the OAL to get the bullet closer to the lands to make it more accurate. I guess they shouldn't do that? The only thing I've ever seen different between 5.56 and 223 is they crimp the primers on the nato stuff.

Flame away.
5.56 is just a little tiny bit bigger than .223 so if u have a gun chambered in 5.56 shooting .223 isnt a problem but shooting a 5.56 through a .223 gun is a problem
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Old 02-26-2013, 11:51 PM   #13
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From ATK/ Federal Cartridge- copy and paste-


5.56 vs/ .223
To ensure operational reliability, the 5.56 round is designed to operate at significantly higher pressures, namely just short of 59,000 psi (case mouth meaured) which equates to almost 62,000psi when measured via conformal transducer (as done by SAAMI).

The SAAMI max set forth for the 223 is 55,000psi (conformal transducer).

To facilitate operating under these higher pressures, a 5.56 cartridge case possesses a stronger web design (thicker case walls towards the head), reducing internal powder volume, an important consideration for reloaders.
The remaining differences are found in the chambering of the weapon. A 5.56 chambered weapon differs from a .223 in the throat and freebore. A 5.56 throat is approx. 30 thousandths of an inch longer and 3 thousandths of an inch larger in diameter than a 223 chamber. In addition, the throat or “start point” of the rifling, the taper with which the lands begin, is at a lesser angle, more gradual in a 5.56 than in the .223.

These rather small, but very important differences, allow peak pressures to drop adequately before the bullet engages the rifling and also allow for more build-up of fouling and shooting residue without impeding function.

What does all this mean? In short, you can safely fire all 5.56 AND .223 ammunition in a gun properly chambered for 5.56. You MUST NOT fire 5.56 ammunition in a 223 rifle. As case in point, I fired XM193 5.56 ammunition in a .223 test barrel with average pressures (conformal transducer) of 72,550 psi, and peak pressure registered at 76,250 psi. Continued shooting of 5.56 ammunition in guns not chambered for 5.56 will show many warning signs of over-pressure, such as flattening of primers, smearing of the head stamp, dropped primers, blown primers and pre-mature wear on extractors and bolts.


If you disagree with that do not tell me- I am not the author. Tell the people that make the ammo.
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Old 02-27-2013, 03:55 PM   #14
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C3,

THANK YOU
!

The straight skinny from the horse's mouth!

I hope this puts these threads to rest.

Hey! How's 'bout putting that post in a new thread and making it sticky?
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Old 03-21-2013, 11:22 AM   #15
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These are both factory loaded ammo, not custom hand loads.

5.56 on the left, .223 on the right.


Tell me there is no difference in the ammo.

.223 - 5.56 nato - Auto & Semi-Auto Discussion
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Old 03-21-2013, 11:31 AM   #16
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I learned about these differences from my son, who has a .223 that he uses for chucks, etc. He is a detail guy and I am glad of it.
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Old 03-21-2013, 01:11 PM   #17
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Quote:
Originally Posted by 70cuda383
These are both factory loaded ammo, not custom hand loads.

5.56 on the left, .223 on the right.

Tell me there is no difference in the ammo.

What are the weights of the bullets in both of those? Is one 55 and the other 62-70? That would be my first estimate. I have seen differences like that even in 9mm but made by different manufacturers and the same weight projectile. Some runs of ammo will have the bullet further into the neck than others.
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Old 03-24-2013, 05:30 AM   #18
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Originally Posted by rjd3282
There are those that say you can't shoot 5.56 from a 223 chamber. Personally I haven't had anyone explain it to me that makes sense. Some say 5.56 is loaded hotter than 223 but if you look you can find 223 ammo that is faster than 5.56 ammo with the same bullet. Only one way to do that and that's add more powder/pressure. Dimensionally it is the same ammo. Then there are some that say 5.56 uses thicker brass but after extensive testing myself, the two cases weigh exactly the same. Both hold the same amount of water. Then there's the people that say the 223 chamber has a shorter throat and it causes the 5.56 ammo to spike pressures. Again demsionally the same so if it doesn't spike with 223 ammo I don't know how it will spike with 5.56. Also many reloaders adjust the OAL to get the bullet closer to the lands to make it more accurate. I guess they shouldn't do that? The only thing I've ever seen different between 5.56 and 223 is they crimp the primers on the nato stuff.

Flame away.
Pressure created when firing a 5.56 is significantly higher than a .223. Firing a 5.56 in a gun specifically designed for a .223 can cause your barrel to explode. It isn't worth the risk of destroying your gun or or the pain and suffering when you find yourself in the emergency room.
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Old 03-25-2013, 01:43 AM   #19
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Very interesting , check out this Colt 6920 I seen today.

Notice the box- 223 and the lower 5.56


image-412743365.jpg
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Old 03-25-2013, 02:13 AM   #20
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Quote:
Originally Posted by 70cuda383 View Post
These are both factory loaded ammo, not custom hand loads.

5.56 on the left, .223 on the right.

Tell me there is no difference in the ammo.
5.56 is a higher pressure load, and the bullet is just slightly bigger, u need a micrometer to tell
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