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Posted: 10/21/2013 11:27:34 PM EST
I remember reading that switching between the two can cause problems, but I can't find the thread I was reading about that. Looked through ammo oracle and didn't find it. My search fu could be weak or I am blind. Please let me know the dangers, if any, of switching between 5.56 and .223.

Rifle: Windham Weaponry MPC, 5.56 marked bbl
Link Posted: 10/21/2013 11:52:37 PM EST
Link Posted: 10/22/2013 12:34:31 AM EST
I vaguely remember something about switching between the two without cleaning. I don't think I'm making it up, but anything is possible...
Link Posted: 10/22/2013 2:08:59 AM EST
[Last Edit: 10/22/2013 2:10:01 AM EST by 1Devildog]
I think you mean switching between steel cased and brass cased ammunition... Steel cased ammunition leaves more powder residue in the chamber and switching to brass cases without cleaning can cause stuck cases. I experimented with this and found that after firing approximately 100 rounds of steel cased .223 when I switched to brass cased .223, the first 10 or so empty cases came out very dirty. Afterwards, the cases came out with the normal amount of powder residue on them. I did not have sticking issues, but I could see how in some rifles it might happen. I have read accounts of others that did experience stoppages related to this issue.

Switching between .223 and 5.56 should cause no issues.

1DD
Link Posted: 10/22/2013 3:15:49 AM EST
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Originally Posted By 1Devildog:
I think you mean switching between steel cased and brass cased ammunition... Steel cased ammunition leaves more powder residue in the chamber and switching to brass cases without cleaning can cause stuck cases. I experimented with this and found that after firing approximately 100 rounds of steel cased .223 when I switched to brass cased .223, the first 10 or so empty cases came out very dirty. Afterwards, the cases came out with the normal amount of powder residue on them. I did not have sticking issues, but I could see how in some rifles it might happen. I have read accounts of others that did experience stoppages related to this issue.

Switching between .223 and 5.56 should cause no issues.

1DD
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Here is the answer.

End thread
Link Posted: 10/22/2013 4:43:02 AM EST
No issues. Just shoot it. Clean when needed.
Link Posted: 10/24/2013 2:33:34 AM EST
No issues unless you have a barrel rated only for .223 then you should never use 5.56.
(I know this is common knowledge but wanted to post it in case a new shooter reads this
thread)
Link Posted: 10/24/2013 3:02:51 AM EST
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Originally Posted By RoninArt:
No issues unless you have a barrel rated only for .223 then you should never use 5.56.
(I know this is common knowledge but wanted to post it in case a new shooter reads this
thread)
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Right. OP's barrel is marked 5.56, so he has no worries. Moral of the story - check your barrel. If it's 5.56 (or Wylde) you can use either. If it's marked .223, do not use 5.56 ammo. I would think that very few AR-15's are chambered in .223 these days. Bolt guns are a whole other story, as many of them are indeed chambered in .223.
Link Posted: 10/24/2013 3:29:30 AM EST
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Originally Posted By CapsFan:
I vaguely remember something about switching between the two without cleaning. I don't think I'm making it up, but anything is possible...
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that was brass and steel from the box o truth fame
Link Posted: 10/26/2013 12:29:20 PM EST
Originally Posted By CapsFan:
I remember reading that switching between the two can cause problems, but I can't find the thread I was reading about that. Looked through ammo oracle and didn't find it. My search fu could be weak or I am blind. Please let me know the dangers, if any, of switching between 5.56 and .223.

Rifle: Windham Weaponry MPC, 5.56 marked bbl
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Not sure if you mean mixing them in the same magazine. However, a gun marked 5.56 should fire both .223 and 5.56. Don't read the marking on the receiver, instead read the markings on the barrel to ensure it's marked 5.56.

Now what is dangerous is when you shoot a 5.56 out of a barrel marked for .223. There's a chance that it can overpressure and cause damage, possibly injuring/killing you or others. However, Windham Weaponry is what is formally Bushmaster Windham factory. With that in mind, every Bushmaster I know that was made in Windham was fitted for 5.56. Since they're using the same factory/machines as they did in the past, I'm sure it's the same deal.
Link Posted: 10/27/2013 7:07:47 AM EST
I contacted the manufacturer of my AR and they stated that it's been tested with both .223 and 5.56 and that shooting both is fine. I also recall a similar statement in the OM.
Link Posted: 10/27/2013 3:38:03 PM EST
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Originally Posted By osprey21:
Dangers?

I've never had any problems.
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+1 here.........
Link Posted: 10/27/2013 11:22:07 PM EST
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Originally Posted By 1Devildog:
I think you mean switching between steel cased and brass cased ammunition... Steel cased ammunition leaves more powder residue in the chamber and switching to brass cases without cleaning can cause stuck cases. I experimented with this and found that after firing approximately 100 rounds of steel cased .223 when I switched to brass cased .223, the first 10 or so empty cases came out very dirty. Afterwards, the cases came out with the normal amount of powder residue on them. I did not have sticking issues, but I could see how in some rifles it might happen. I have read accounts of others that did experience stoppages related to this issue.

Switching between .223 and 5.56 should cause no issues.

1DD
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This doesn't apply to the Zinc cases from the MDS ammo however as I've switched back and forth between those and brass and it just keeps blastin away.
Link Posted: 10/28/2013 6:03:31 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By 1Devildog:
I think you mean switching between steel cased and brass cased ammunition... Steel cased ammunition leaves more powder residue in the chamber and switching to brass cases without cleaning can cause stuck cases. I experimented with this and found that after firing approximately 100 rounds of steel cased .223 when I switched to brass cased .223, the first 10 or so empty cases came out very dirty. Afterwards, the cases came out with the normal amount of powder residue on them. I did not have sticking issues, but I could see how in some rifles it might happen. I have read accounts of others that did experience stoppages related to this issue.

Switching between .223 and 5.56 should cause no issues.

1DD
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I switch between steel case & brass & back again with zero problems. Maybe some guns have a problem, I never encounter it with any of the ones I have had.
Link Posted: 10/29/2013 5:50:11 PM EST
No issues. I shoot steel, brass, 5.56 and 223 with no problems. As others have pointed out, don't shoot 5.56 if the barrel is stamped for .223.
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