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 Not shooting 556 in a 223 chamber
#6613642
01/03/17 05:09 AM
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Joined: May 2011
Posts: 358
Matt Hejl
OP
Bird Dog
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OP
Bird Dog
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Posts: 358 |
What is the actual chamber differences in stock 223 ammo vs 556?
What's the difference in reloaders pushing as hot of loads as they can when reloading 223 vs shooting 556 stock ammo and pressures?
Could you not shoot 556 ammo in a 223 chamber if it didn't show any pressure signs?
Last edited by Matt Hejl; 01/03/17 05:09 AM.
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6613658
01/03/17 05:29 AM
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Joined: Apr 2011
Posts: 988
okie44
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Tracker
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A good read on the subject linky
�The trouble ain't that there is too many fools, but that the lightning ain't distributed right.�
Mark Twain
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Re: Not shooting 556 in a 223 chamber
[Re: okie44]
#6613685
01/03/17 06:45 AM
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Joined: Jan 2011
Posts: 65,514
SnakeWrangler
THF Celebrity
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Joined: Jan 2011
Posts: 65,514 |
A good read on the subject linky Thanks for posting....good info....
I believe in science and I’m an insufferable [censored] Actually, BBC is pretty damn good "You Cannot Simultaneously Be Politically Correct And Intellectually Honest!"
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6613939
01/03/17 03:04 PM
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Joined: Nov 2007
Posts: 9,516
RiverRider
THF Trophy Hunter
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If anyone can locate actual military specification documents showing 60000+ psi via SCATP testing methods for 5.56 ammo, I would love to see it.
![[Linked Image]](https://i.imgur.com/Kqs020H.jpg) "Arguing with you always makes me thirsty." -Augustus McRae
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6613996
01/03/17 03:27 PM
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Joined: Sep 2006
Posts: 32,482
kmon11
junior
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junior
Joined: Sep 2006
Posts: 32,482 |
I would like to see that as well RR.
CIP European standards organization does pressure a bit different not just measurement location but in others like max average pressure. Nato/European specs to SAAMI are like apples to oranges, both fruit but different. SAAMI and CIP both specs but different
lf the saying "Liar, Liar your pants on fire" were true
Mainstream news might be fun to watch
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Re: Not shooting 556 in a 223 chamber
[Re: RiverRider]
#6613998
01/03/17 03:28 PM
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Joined: May 2013
Posts: 836
BushFamilyNine
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If anyone can locate actual military specification documents showing 60000+ psi via SCATP testing methods for 5.56 ammo, I would love to see it. I think that I have the specs showing 63ooo psi for 5.56, but will have to look when I get back home. This is an actual military US Govt resource manual giving the full dimensions and pressures for all military ammunition and artillery. Now knowing whether or not this is actual real world data is a totally different matter.
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Re: Not shooting 556 in a 223 chamber
[Re: RiverRider]
#6614032
01/03/17 03:46 PM
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Joined: Apr 2011
Posts: 988
okie44
Tracker
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Tracker
Joined: Apr 2011
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If anyone can locate actual military specification documents showing 60000+ psi via SCATP testing methods for 5.56 ammo, I would love to see it.
�The trouble ain't that there is too many fools, but that the lightning ain't distributed right.�
Mark Twain
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6614078
01/03/17 04:07 PM
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Joined: Sep 2006
Posts: 32,482
kmon11
junior
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junior
Joined: Sep 2006
Posts: 32,482 |
Took a look at the link and even thought they do spec for 61000 max PSI for high max pressure with variations of anomaly loads not a standard diet which they list as 55k
3.7.1 Measurement by copper-crush cylinder.-The average chamber pressure of the sample cartridges, conditioned at 70° ± 2°F, shall not exceed 52,000 pounds per square inch (PSI). The average chamber pressure plus three standard deviations of chamber pressure shall not exceed 58,000 PSI.
3.7.2 Measurement by piezoelectric transducer.-The average chamber pressure of the sample cartridges, conditioned at 70° ± 2°F, shall not exceed 55,000 PSI. The average chamber pressure plus three standard deviations of chamber pressure shall not exceed 61,000 PSI.
lf the saying "Liar, Liar your pants on fire" were true
Mainstream news might be fun to watch
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Re: Not shooting 556 in a 223 chamber
[Re: okie44]
#6614087
01/03/17 04:10 PM
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Joined: Nov 2007
Posts: 9,516
RiverRider
THF Trophy Hunter
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If anyone can locate actual military specification documents showing 60000+ psi via SCATP testing methods for 5.56 ammo, I would love to see it. Ive seen this one, I believe. But thanks for posting it, and I hope some other folks take the time to look it over.
"Arguing with you always makes me thirsty." -Augustus McRae
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Re: Not shooting 556 in a 223 chamber
[Re: kmon11]
#6614098
01/03/17 04:13 PM
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Joined: Nov 2007
Posts: 9,516
RiverRider
THF Trophy Hunter
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THF Trophy Hunter
Joined: Nov 2007
Posts: 9,516 |
Took a look at the link and even thought they do spec for 61000 max PSI for high max pressure with variations of anomaly loads not a standard diet which they list as 55k
3.7.1 Measurement by copper-crush cylinder.-The average chamber pressure of the sample cartridges, conditioned at 70° ± 2°F, shall not exceed 52,000 pounds per square inch (PSI). The average chamber pressure plus three standard deviations of chamber pressure shall not exceed 58,000 PSI.
3.7.2 Measurement by piezoelectric transducer.-The average chamber pressure of the sample cartridges, conditioned at 70° ± 2°F, shall not exceed 55,000 PSI. The average chamber pressure plus three standard deviations of chamber pressure shall not exceed 61,000 PSI. Yup. I'm sure many will misinterpret that to mean 61000 psi loading data is okay, too...just as CIP and EPVAT specs are abused.
"Arguing with you always makes me thirsty." -Augustus McRae
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6614112
01/03/17 04:22 PM
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Joined: Apr 2011
Posts: 988
okie44
Tracker
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Western Powder data adds to the confusion. They have data for 5.56 that is listed @ 62,350 P.S.I. Data for 223 and 5.56 on pages 28-32. Linky III
�The trouble ain't that there is too many fools, but that the lightning ain't distributed right.�
Mark Twain
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6614118
01/03/17 04:25 PM
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Joined: Nov 2007
Posts: 9,516
RiverRider
THF Trophy Hunter
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Yep. That one concerns me. I've seen this kind of thing in other places as well, but I have never seen an AUTHORITATIVE document specifying average pressures of 62000 psi as measured by SCATP or SAAMI methods for 5.56 ammo.
"Arguing with you always makes me thirsty." -Augustus McRae
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6614126
01/03/17 04:28 PM
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Joined: Apr 2011
Posts: 988
okie44
Tracker
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Tracker
Joined: Apr 2011
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It all boils down to the individual chamber. I have a Super 14" Contender that I cannot get close to published 223 data while my 24" 5.56 AR will not show pressure signs with loads beyond those published.
�The trouble ain't that there is too many fools, but that the lightning ain't distributed right.�
Mark Twain
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6614178
01/03/17 04:55 PM
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Joined: May 2011
Posts: 358
Matt Hejl
OP
Bird Dog
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OP
Bird Dog
Joined: May 2011
Posts: 358 |
So say I had a 223 break barrel single shot and I had some 556 ammo and shot it. Primers werent completely flat and showed now issues of pressure...its ok to shoot?
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Re: Not shooting 556 in a 223 chamber
[Re: Matt Hejl]
#6614185
01/03/17 05:00 PM
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Joined: Nov 2007
Posts: 9,516
RiverRider
THF Trophy Hunter
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THF Trophy Hunter
Joined: Nov 2007
Posts: 9,516 |
I think so, but I'd check to make sure the bullet isn't jammed into the lands before firing it. I'd also make sure the ammo is loaded to genuine specs, too. In other words, 60000 psi is okay if its pressure is measured by CIP or EPVAT methods. Know uour manufacturer, I would say.
"Arguing with you always makes me thirsty." -Augustus McRae
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