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is the pressure difference between .223 / 5.56 #3072041
03/19/20 04:24 PM
03/19/20 04:24 PM
Joined: Dec 2018
Posts: 2,070
Alabama
strikeu Offline OP
8 point
strikeu  Offline OP
8 point
Joined: Dec 2018
Posts: 2,070
Alabama
a big deal?

I see some places that say the pressure difference (55k vs 60k) is no big deal then some places say you should never put 5.56 x 45 (5.56NATO) through a weapon chambered for .223

what's y'alls opinion (or the ground truth)?

Re: is the pressure difference between .223 / 5.56 [Re: strikeu] #3072063
03/19/20 04:44 PM
03/19/20 04:44 PM
Joined: Oct 2008
Posts: 6,717
Selma
odocoileus Online content
14 point
odocoileus  Online Content
14 point
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Posts: 6,717
Selma
You could write two books on the subject, but my hard and fast rule is this. In the 5.56 and .223 Wylde guns, I run whatever. In .223 chambered guns, shoot only .223. The 223 has a shorter throat, that with increased pressure loads, could be too much. Maybe would be ok, but I really don't want a rifle coming apart next to my face. The Wylde chamber supposedly gives you the best of both worlds, ability to use whatever ammo with "theoretical" increased accuracy.

Re: is the pressure difference between .223 / 5.56 [Re: strikeu] #3072070
03/19/20 04:48 PM
03/19/20 04:48 PM
Joined: Sep 2007
Posts: 7,561
Hartselle, AL
trlrdrdave Offline
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trlrdrdave  Offline
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Hartselle, AL
My opinion and take it for what you will. There ain't enough difference to matter. Don't do it now because I shoot my on reloads, but I have shot 5.56 in a .223 marked rifle and no issues. Taken to an extreme with high pressure 5.56 shot in a weak chambered .223 there might could be an issue. I have bought .223 that measured exactly the same as some once fired .mil brass. Held exactly the same amount of water too. Maybe years ago there was a bigger difference I don't know.


"In time of war, send me all the Alabamians you can get, but in time of peace, for Lord's sake, send them to somebody else." General Edward H. Plummer

"Blessed are those who, in the face of death, think only about the front sight." Jeff Cooper
Re: is the pressure difference between .223 / 5.56 [Re: odocoileus] #3072071
03/19/20 04:49 PM
03/19/20 04:49 PM
Joined: Dec 2018
Posts: 2,070
Alabama
strikeu Offline OP
8 point
strikeu  Offline OP
8 point
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Posts: 2,070
Alabama
Originally Posted by odocoileus
You could write two books on the subject, but my hard and fast rule is this. In the 5.56 and .223 Wylde guns, I run whatever. In .223 chambered guns, shoot only .223. The 223 has a shorter throat, that with increased pressure loads, could be too much. Maybe would be ok, but I really don't want a rifle coming apart next to my face. The Wylde chamber supposedly gives you the best of both worlds, ability to use whatever ammo with "theoretical" increased accuracy.



I'm following. safety first, but some folks "chicken little" over the slightest thing.

I have the M4 so I can use either round...but I see some .223 chambered AR-15s that are decent priced, but I would like to just use the ammo I already have (which is mostly 5.56)

PLUS someone listed the green tip stuff on here and I missed it...it was gone in like an hour!

Re: is the pressure difference between .223 / 5.56 [Re: trlrdrdave] #3072102
03/19/20 05:23 PM
03/19/20 05:23 PM
Joined: Oct 2008
Posts: 6,717
Selma
odocoileus Online content
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odocoileus  Online Content
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Posts: 6,717
Selma
Get you one and a .223 Wylde barrel, I'll swap it out for you. I built kind of a SPR gun with a 18" criterion HBAR in .223 Wylde. It's plenty accurate for an autoloader. If I want more I grab the bolt .22-250.

From what I have gathered, case dimensions are going to be identical, it's just the chamber they are fired in. I seem to recall the LC brass being heavier and with less case capacity due to the web of the case being thicker. The thought being that most of the ammo is going in full auto guns with slightly larger chamber body dimensions to cut down failure to feed/eject, and the thicker brass equaled less ruptured cases, head separations, etc.

Re: is the pressure difference between .223 / 5.56 [Re: strikeu] #3072177
03/19/20 06:16 PM
03/19/20 06:16 PM
Joined: Feb 2002
Posts: 44,211
North Alabama
W
Wiley Coyote Offline
Freak of Nature
Wiley Coyote  Offline
Freak of Nature
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North Alabama
THE situation in all that is with surplus/military ammo the 5.56 brass is thicker than .223 and therefore holds less powder/creates more pressure. If you load 5.56 cases this is particularly important.


I firmly believe that a double gallows should be constructed on the East Lawn of The White House. Politicians who willfully and shamelessly violate their oath to uphold and defend the Constitution of the United States of America should be swiftly tried and, upon conviction, publicly hanged at sunup the day after conviction. If multiple convicts are to be hanged they can choose with whom to share the gallows or names shall be drawn from the hangman's hat to be hanged 2 at a time.




NRA Life Member
Re: is the pressure difference between .223 / 5.56 [Re: trlrdrdave] #3072377
03/19/20 08:50 PM
03/19/20 08:50 PM
Joined: Sep 2012
Posts: 17,922
North AL
A
AU338MAG Offline
Old Mossy Horns
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Originally Posted by trlrdrdave
My opinion and take it for what you will. There ain't enough difference to matter. Don't do it now because I shoot my on reloads, but I have shot 5.56 in a .223 marked rifle and no issues. Taken to an extreme with high pressure 5.56 shot in a weak chambered .223 there might could be an issue. I have bought .223 that measured exactly the same as some once fired .mil brass. Held exactly the same amount of water too. Maybe years ago there was a bigger difference I don't know.

Rifles don't blow up with one hot round. Repeated firing of high pressure rounds will stress the steel until it eventually fails.


Dying ain't much of a living boy...Josey Wales

Molon Labe
Re: is the pressure difference between .223 / 5.56 [Re: odocoileus] #3074249
03/21/20 02:06 PM
03/21/20 02:06 PM
Joined: Jun 2012
Posts: 6,349
D'Iberville, MS
MS_Hunter Online content
12 point
MS_Hunter  Online Content
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Posts: 6,349
D'Iberville, MS
Originally Posted by odocoileus
You could write two books on the subject, but my hard and fast rule is this. In the 5.56 and .223 Wylde guns, I run whatever. In .223 chambered guns, shoot only .223. The 223 has a shorter throat, that with increased pressure loads, could be too much. Maybe would be ok, but I really don't want a rifle coming apart next to my face. The Wylde chamber supposedly gives you the best of both worlds, ability to use whatever ammo with "theoretical" increased accuracy.

^^^^^^^^^


In your darkest hour when the demons come, call on me brother and we'll fight them together.
Re: is the pressure difference between .223 / 5.56 [Re: strikeu] #3074267
03/21/20 02:37 PM
03/21/20 02:37 PM
Joined: Sep 2012
Posts: 7,230
just south of the Tennesse riv...
R
roadkill Offline
14 point
roadkill  Offline
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Posts: 7,230
just south of the Tennesse riv...
In addition to the excellent info already given when the .223 remington was created (1957) there was no 5.56mm round. In 1980, the .223 Remington was transformed into a new cartridge, a 62-gr full metal jacket bullet with a 7-gr steel core for better penetration and designated 5.56×45mm NATO (SS109 or M855).

Re: is the pressure difference between .223 / 5.56 [Re: roadkill] #3075739
03/22/20 04:40 PM
03/22/20 04:40 PM
Joined: Nov 2013
Posts: 10,249
coffee county
goodman_hunter Offline
Booner
goodman_hunter  Offline
Booner
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Posts: 10,249
coffee county
Originally Posted by roadkill
In addition to the excellent info already given when the .223 remington was created (1957) there was no 5.56mm round. In 1980, the .223 Remington was transformed into a new cartridge, a 62-gr full metal jacket bullet with a 7-gr steel core for better penetration and designated 5.56×45mm NATO (SS109 or M855).

That's why on some old rifles like Colt ar15, it say 223 but is acceptable to fire 556. Or so I've been told.

Last edited by goodman_hunter; 03/22/20 04:41 PM.

For without victory, there is no survival
Re: is the pressure difference between .223 / 5.56 [Re: strikeu] #3076114
03/22/20 08:52 PM
03/22/20 08:52 PM
Joined: Dec 2012
Posts: 9,643
Pisgah Al
Bigbamaboy Offline
14 point
Bigbamaboy  Offline
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Pisgah Al
I haven’t seen any currently produced AR labeled 223 only. Either 223 Wylde or 556.


Eli, Eli, lama sabachthani?
Re: is the pressure difference between .223 / 5.56 [Re: strikeu] #3081078
03/26/20 06:49 PM
03/26/20 06:49 PM
Joined: Apr 2014
Posts: 549
ALABAMA
Boom Offline
4 point
Boom  Offline
4 point
Joined: Apr 2014
Posts: 549
ALABAMA
Just go by the book. who cares? work a load up safely that performs for you. a few extra FPS don't matter, only the hits in the 10 ring


BOOM


HRCH Superchamp's Pocket Change MH, "PESO"

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