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Old 11-14-2012, 04:33 AM   #11
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Chambers cut to .223 Rem specs have a shorter leade area as well as slightly shorter headspace dimension compared to the 5.56 military chamber. This contributes to the pressure issues.
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Old 11-14-2012, 12:54 PM   #12
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Higher pressures, yes, KB dangerous pressures, No.

Barnes test.

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Old 11-14-2012, 08:46 PM   #13
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What happens if you shoot a 5.56 through a 223

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Old 11-15-2012, 12:25 AM   #14
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Quote:
Originally Posted by canebrake View Post


Chambers cut to .223 Rem specs have a shorter leade area as well as slightly shorter headspace dimension compared to the 5.56 military chamber. This contributes to the pressure issues.
Thanks Cane, another great post.
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Old 11-15-2012, 12:58 AM   #15
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Originally Posted by ryanusmc24 View Post
What happens if you shoot a 5.56 through a 223
The sun caves in on itself, your face melts and dogs start loving cats.

The worst things I have seen are blown primers getting hung up in the fire control group and high pressure signs on case heads.

It is more stress on teh gun and can cause accelerated wear on parts. Bolt cracking is a possibility down the road, extractor wear, and bad things if you did get an ignition with the bolt not fully in battery. SO , I subscribe to the school of "it is not recommended to shoot 5.56 rounds in a .223 chambered barrel."
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Old 11-15-2012, 01:01 AM   #16
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What happens if you shoot a 5.56 through a 223
most likely nothing. the real danger is military rounds (556) use longer ogives on their bullets which in a dirty fouled barrel/chamber can greatly exceed the pressure curve and go kaboom. this makes the bullet actually touch the lands the chamber is tighter bullet is seated a scootch too far forward a few more grains of powder drop in the case during loading top it off with a little crud and everything combines the wrong way you go boom.

so while the first 5000 may go just fine then you draw the lucky card at 5001 and you end up on the interweb with pics of your gun all over the place
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Old 11-15-2012, 02:37 AM   #17
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Just remember- as the pregnant young lady said- "Hundreds of times nothing at all happened."

It only takes once. Feel lucky? By all means, please proceed. Down at the last firing point, when none of your body fluids will be splashed this far.

Oh- and if anything should happen to you.....can I have your guns?

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Old 11-15-2012, 02:49 AM   #18
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If I'm shooting all my guns are with me so they will all be gone too! :grins face:

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Old 11-15-2012, 02:58 AM   #19
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What happens if you shoot a 5.56 through a 223
Read the pressure chart above. The answer, higher velocity and higher pressure, but as a shooter without testing equipment, NOTHING, you will not know the difference.
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Old 11-16-2012, 09:38 PM   #20
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Since 1968 i've fired at least least 200,000 rounds of 5.56mm ammo in .223 rifle chambers with no problems. About the time large quantities of military surplus ammo hit the market SAAMI warned folks about firing 5.56mm ammo in .223 chambers. Some of what SAAMI says is pure bull$hit. For instance: US military cases are not thicker than commercial cases.

What you thought you knew about .223/5.56mm ammo, chambers, pressure, etc may be wrong:

http://www.luckygunner.com/labs/5-56-vs-223/

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