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 Post subject: Broken Bolt Lug
PostPosted: Fri Mar 12, 2010 7:42 pm 
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Mil-Surp Owner
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Joined: Wed Apr 19, 2006 3:55 pm
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Location: California
Age: 56
While shooting my IBM Carbine at the range this morning, the gun jammed. On closer inspection, I saw a crack in the bolt lug (photo attached). I was shooting reloads, 14.5 gr, Win 296, with magnum primer. This was only the second time that I have shot it since getting it from CMP. I'm guessing there may have been a crack (maybe hidden) before I got it. The load I'm using seems fairly normal and maybe a bit on the low side. Any comments on what may have happened here?


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 Post subject: Re: Broken Bolt Lug
PostPosted: Fri Mar 12, 2010 8:29 pm 
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Location: Albuquerque, New Mexico
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You are one lucky SOB. Had the lug sheared under full pressure, you could kiss your eyesight and a better part of your face good by.
Because of what just happened to you, I always wear safety glasses of some sort. The M1 carbines being sold today have been shot an awful lot. Many were M2's and converted back to M1's.
While I was in the Nam, we got an emergency ORDALT to have all M1 carbine bolts and receivers magnafluxed due to hairline cracks forming. From what you write it sounds like you have one of those bolts.
I'm so glad you were not hurt.

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 Post subject: Re: Broken Bolt Lug
PostPosted: Fri Mar 12, 2010 10:25 pm 
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Mil-Surp Museum Curator
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Joined: Thu Apr 20, 2006 6:43 pm
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Take a look at your reciever and make sure that there is no damage to it where either side of the bolt locks up. It also could be the cause of bolt failure.

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 Post subject: Re: Broken Bolt Lug
PostPosted: Fri Mar 12, 2010 10:52 pm 
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Mil-Surp Psychosis
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That little round could not cause that damage !

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 Post subject: Re: Broken Bolt Lug
PostPosted: Fri Mar 12, 2010 11:12 pm 
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Benefactor
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Joined: Mon Apr 17, 2006 7:31 am
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Location: Central CA
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Call the CMP right away and see about sending it to their armorers.

Regards,
Brian in CA


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 Post subject: Re: Broken Bolt Lug
PostPosted: Fri Mar 12, 2010 11:17 pm 
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Mil-Surp Museum Curator
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snipertomt wrote:
That little round could not cause that damage !


They can if the cases were not resized properly before reloading. It would be like having improper headspace.


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 Post subject: Re: Broken Bolt Lug
PostPosted: Sat Mar 13, 2010 11:29 am 
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That load seems a bit hot to me. Max load with that powder is about 15. gr, (depending on source) with standard Small Rifle primer. You state you are using a Magnum primer, so I will assume you means small rifle magnum. Using a magnum primer is like adding a 1 - 1.5 gr to your powder charge. While that is a magnum powder and requires hotter primers, the round uses rifle primers which tend to be hotter than pistol primers. So, magnum small rifle primers are not needed.
If I recall correctly, Winchesters manual lists that as a maximum charge, and with that powder, not to reduce loads below 90%, plus with Standard Winchester Small Rifle primers.


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