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9/22/2017 12:11:25 AM
Posted: 9/2/2005 11:10:44 PM EDT
I searched I promise, looked around at links...nothing...so help a uber noober out.
Link Posted: 9/2/2005 11:18:22 PM EDT
Check out teh Ammo oracle, located in the ammo sec.
Link Posted: 9/2/2005 11:22:28 PM EDT
Link Posted: 9/3/2005 4:00:07 AM EDT
The 5.56 can withstand higher pressures, allowing a higher velocity than the .223. Difference in caliber width is extremely miniscule.
Link Posted: 9/3/2005 5:30:06 AM EDT

Originally Posted By safetyhit:
Difference in caliber width is extremely miniscule.

But big enough to be extremely dangerous in the right conditions. Firing 5.56 ammo in a .223 chamber can be devastating. Generelly it is not an issue, but I'd hate to find out.
Link Posted: 9/3/2005 5:44:12 AM EDT
[Last Edit: 9/3/2005 6:00:30 AM EDT by Th_Inker]
I would have to say Safetyhit and Mongo001 hit it dead center.

Generaly same exact round except the 5.56 NATO chamber will withstand higher pressures for a little more velocity. At least that is my understanding of differences between the two.

Although I am not up to date on this chamber , I think there is one in between those two called the Wilde chamber , it falls in between the .223 and 5.56 NATO chambers I believe. Just dont shoot me if i am mistaken on that Wilde chamber. I never had one chambered to that so if I am wrong about the Wilde chamber , I will surely be corrected shortly and will learn sumtin new today.
Link Posted: 9/3/2005 6:05:54 AM EDT
The difference is in the throat and lead angle (where the bullet is in the chamber). A tighter .223 chamber can set back the bullet in a 5.56 cartridge. Since 5.56 runs at a higher pressure to begin with, a setback bullet in a 5.56 cartridge can KABOOM a rifle. While generally this isn't an issue, it has been in the past.
Link Posted: 9/3/2005 10:07:23 AM EDT
So its best for me to get a 5.56 chamber in my rifle even if i might rarely shoot mil ammo? The "miniscule" difference won't matter with the 5.56 shooting the .223 right? Gotta make sure before I buy my upper.
Link Posted: 9/3/2005 11:03:56 AM EDT
A barrel with a 5.56 chamber will shoot .223 just fine.
Link Posted: 9/3/2005 11:26:47 AM EDT
So then how can everyone shoot M855? Isn't that 5.56?
Link Posted: 9/3/2005 12:28:59 PM EDT
Totally unrelated but www.ammo-oracle.com is a very informative site though it took me about 2 hours to read all of it but it did answer alot of questions I had. I'd recomend anyone that wants to learn about .223/5.56 ammunition read it.
Link Posted: 9/4/2005 5:14:39 PM EDT

Originally Posted By USMARINE1108:
So then how can everyone shoot M855? Isn't that 5.56?

Yes, it is 5.56. Everyone (.223 cal only rifles) should not shoot it. Like Mongo says, it can potentially be dangerous in a .223 only chamber. The key word is "potentially", as I have never had or seen this problem first hand. But I have not pushed my luck, either.
Link Posted: 9/4/2005 5:44:27 PM EDT
It's all just hysteria.....

My .223 chambered barel shoot's NATO 5.56 surplus with no real problem (in fact it is pretty accurate) as long as I keep the chamber clean. And only then do they become harder to extract manualy. As I do not shoot semi-auto i cannot comment on the facts relating to that.

This said i'd go for a 5.56 chambered rifle to ease any concerns.

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