Broken Bolt Lug

shona

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Dec 5, 2013
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Hi,
I have a Weatherby MK V. 338 LM that's sheared a lug off it's 9-lug bolt.
No idea how it occurred & never found the broken piece. The rifle is with a Weatherby agent in Ontario awaiting a decision as to whether the warranty will be accepted or not. Prior to the damage occurring, I notice the bolt was losing its coating in places. That too is being investigated! My question is, has anyone had this or heard of this happening at all & in the event Weatherby declined this claim, how easy & $$$ is it to find a replacement bolt?

Thanks
Shona
 

The D

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  • Apr 11, 2020
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    Pics? How many rounds on the rifle? Were you shooting factory ammo or handloads?

    I have no info on a replacement bolt but if it hasn’t been abused too badly and the warranty is denied I would be buying a different rifle
     

    shona

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    Dec 5, 2013
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    Hi, Guys,
    The rifle has approx 180 rounds down the pipe Max so, I don't think that can be considered as excessive use by any means! My Gunsmith thinks it's definitely a manufacturing flaw/ defective casting etc!
    Either way, it's not something that should cause a Major debate with a warranty claim, I wouldn't have thought! But we shall have to wait & see!

    LATE ADDITION!
    Sorry, forgot to answer the question on whether I was shooting Factory or Reloads! Berger 250 Grn & Lapua Brass...Reloads!

    Thanks
    Shona
     

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    hollowoutadime

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    Feb 27, 2014
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    Powder and grains? That would certainly take down any game on this (and most) continent(s).
     

    jphil108

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    Jul 21, 2010
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    Good thing you had those 8 other lugs keeping that bolt in battery. Seems like a huge stress concentration where the extractor pocket meets the lugs, and another one where the extractor groove meets the bolt face, no ground relief groove or anything to mitigate the stress, I don’t think I’ll be buying a weatherby MK-V anytime soon. I think spife is right about lug contact, I always thought only the first few lugs would be in contact.
     

    Im2bent

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  • Jun 30, 2020
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    Weatherby has reloads as an exclusion for their warranty
     

    jbuck88

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    Oct 25, 2010
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    I would think it has to be a bad bolt from the factory. The weatherby action is know to be very robust and the 338LM is one of their more mild chamberings.

    Either way good luck.
     

    Steel head

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  • Aug 3, 2014
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    I would think it has to be a bad bolt from the factory. The weatherby action is know to be very robust and the 338LM is one of their more mild chamberings.

    Either way good luck.
    Yea
    Unless the lug engagement was wonky I’m thinking a brittle bolt or an alloy issue.
     

    Part Timer

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    Nov 29, 2020
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    I had a .338LM Mark V do this exact same thing with the same lug about 8 or 9 years ago now. Round count of about 30 at that point, which was somewhat depressing as my other hand-me-down Mark V had been and still is excellent. I figured it may have been something to do with the cold as it was about -25 Celsius the day that it happened. Fortunately, I had got the rifle from Cabela's and they had accepted it as faulty after showing them what happened, refunded immediately.