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Thread: Misfire

  1. #1
    Join Date
    May 2013

    Default Misfire

    Hello, I'm new to this forum but have a problem I hope someone can help me with. I have a German made Mark V 300 wby. I have never had a problem until last weekend. I had a misfire with a reload. This weekend I had a few more. I used the same primers in the 243 I was also shooting and had no misfires so I do not think it was the primers.

    When I took the bullets apart and hit the primers that did not work in the gun with a hammer they all fired, so I do not think they were contaminated with oil.

    They were dimpled just like the ones that fired.

    They were all fully seated in clean primer pockets.

    I took the bolt apart and it looks like the firing pin was slightly bent, enough to bind slightly in the hole on the face of the bolt. I straightened it so I think everything should be good. The firing pin travels easy without any more binding.

    My question is, how do I know if I have threaded the pin into the shroud the correct amount? The more I screw it in, the more spring pressure I create, but a some point I will shorten the length of penetration. I believe the correct exposed pin length is 0.55-0.62, but there is a stop inside the bolt barrel that may effectively stop the pin at this depth.

    Also, has anyone else had this problem, because I would like to know how it started.


  2. #2
    Join Date
    Jan 2010
    Michigan, USA

    Default Re: Misfire

    Go ahead and Google "measuring firing pin protrusion" and you'll find exactly the information you need.

  3. Default Re: Misfire

    Weatherby says that the MK V firing pin prostrusion should be .063-.069".

    RUM = Poor Man's Weatherby!

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