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  #1  
Old 03-08-2014, 09:22 PM
xoldsmugglerx xoldsmugglerx is offline
 
Join Date: Feb 2010
Location: NE
Posts: 421
Default Missing Primers

Was shooting my M1 Carbine today which was a rack grade Underwood from the CMP and noticed that two of my brass had problems with the primers. What could the reason for this be? I didn't find the spent primer of the one anywhere but the other just had it sticking out as in the picture. The ammo is magtech factory ammo and I shot about 25 rounds.
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  #2  
Old 03-08-2014, 09:28 PM
Trooper82 Trooper82 is offline
 
Join Date: Jan 2010
Location: Southern Pines NC
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Not good! I have a partial theory involving a rough chamber causing the case to stick but cannot explain how the case head isn't support by the bolt allowing the primer to blow out.
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  #3  
Old 03-08-2014, 09:39 PM
meplat meplat is offline
 
Join Date: Jan 2010
Location: Prescott, AZ
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What does head space look like?

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  #4  
Old 03-08-2014, 09:39 PM
shooter5x shooter5x is offline
 
Join Date: Dec 2009
Posts: 183
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Hey I can actually comment with firsthand experience here. I had the same thing happen with mag tech ammo.
I emailed there customer service, and they took care of me. I sent back the bad box, and they traded me out. I haven't tried the replacement ammo, but my bad one I shot 13 rounds out of 50, and probably 10 or 11 had primers fall completely out, or slid back. I put the empty brass back in the box, with the 37 still unfired rounds, and sent it back to them.
Just be patient, my replacement ammo took probably 2 months to arrive.
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  #5  
Old 03-08-2014, 09:41 PM
shooter5x shooter5x is offline
 
Join Date: Dec 2009
Posts: 183
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Also, I had the problem with this particular ammo in two different usgi carbines that both headspace fine, and use other ammo fine, that's how I determined the cause to be an ammo problem. I think the op's probably in the same boat.
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  #6  
Old 03-08-2014, 10:18 PM
.Steve. .Steve. is offline
 
Join Date: Oct 2009
Posts: 833
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The case head is blown, the primer pocket expands, and the primer falls out.

Something usually seen in 5.56mm brass at about 65-70,000psi from loads making excess pressue.

In a carbine, almost certainly junk soft brass.
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  #7  
Old 03-08-2014, 10:26 PM
ricco ricco is offline
 
Join Date: Oct 2009
Location: Upper Valley, NH
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+1 on .Steve.'s assessment. Soft brass.
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  #8  
Old 03-08-2014, 11:06 PM
shooter5x shooter5x is offline
 
Join Date: Dec 2009
Posts: 183
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Ok, who can Rockwell test their brass and let us know!!
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  #9  
Old 03-09-2014, 12:37 AM
xoldsmugglerx xoldsmugglerx is offline
 
Join Date: Feb 2010
Location: NE
Posts: 421
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Ok, good to know it's probably not the gun. I've shot a few hundred rounds through this carbine (am the second owner) of various makes and never noticed this problem before. I don't think I'll go through shipping the ammo back as the shipping would probably be more than the cost of the ammo. I have shot some magtech in this before, but maybe that was a different lot that was better. I will update this thread with the lot number tomorrow.
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  #10  
Old 03-09-2014, 01:07 AM
shooter5x shooter5x is offline
 
Join Date: Dec 2009
Posts: 183
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I just want to clarify, magtech's customer service was great. They paid shipping both ways, and replaced my one bad box with two! I just wanted to be fair to them, and let folks know they worked to fix the problem.
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