338 Edge missfire

Discussion in 'Long Range Hunting & Shooting' started by tugger, Sep 12, 2019 at 5:16 AM.


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  1. tugger

    tugger Member

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    So I load up my brass as usual and head out to the range, and to my amazement all of a sudden I have about 50% misfires, The primers are all dented, however they seem that may be a little lightly dented. This batch of brass has been loaded about 5 times (f.l. resized, bumped back .002).

    I am wondering if this is normal Indication of case wear due to the high pressures of the 338 edge, this is something that I have never experienced before. My intention is to pull the bullets and start a new batch of brass, before I send it away to the smith. I guess it should be mentioned that this is just cheap Remington brass, loaded up with 84.5 gr of H 1000, pushing a 300 gr. Accubond at 2650 FPS, chambered in model 700.
    Not really a hot load at all, and I have been thinking about pushing to up to the next node.
    I am fairly new to this caliber, I must say the more I shoot it, the more I love it, great work Shawn!

    Any comments or advice would be greatly appreciated.

    Thanks
     
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  2. MagMan

    MagMan Well-Known Member

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    By chance are you running a lightweight firing pin and spring?
     
  3. TwoMore

    TwoMore Well-Known Member LRH Team Member

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    I shoot rem brass in my edge and never had any problems. I would look into magmans post and check either my firing pin or spring, sometimes the pin can get dirty at the shoulder and keep it from fully protruding or the spring can get weak.

    one question is did you prime the cases when you loaded or before hand?
     
  4. MagMan

    MagMan Well-Known Member

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    If the primers weren’t fully seated to the shoulder you could have that problem.

    Still betting on the pin/spring though.
     
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  5. Rum Man

    Rum Man Well-Known Member

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    Clean the bolt it must be dirty .

    I'm running 3 different 338 Edges with Remington Brass and Cci mag 250 primers up to 92 gr. Of H-1000 with no problem at all . Two built on Remington action and one on a Lawton .
    Please work up if you try that much of a Charge .

    Rum Man
     
  6. Elk Hunter 338

    Elk Hunter 338 Well-Known Member

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    that's really light load most run in the 87-90 gr range and I would guess like others have stated there is maybe something wrong with spring or dirty bolt
     
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  7. lewillia

    lewillia Member

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    Measure your firing pin protrusion after you disassemble and clean the bolt, spring and pin as well as double check how far you bumped that shoulder IMHO.
     
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  8. Doublezranch

    Doublezranch Well-Known Member

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    Is it a Remington 700 action? If so, I completely agree with the lightweight firing assembly being the culprit. However, I have seen a Tubbs Speedlock go the opposite way and destroy a bolt due to a long pin protrusion. Measure your protrusion and see if it’s at specs. If so, then likely the lightweight assembly spring (s) might not be hitting the primer hard enough. They seem to wear out a little faster than factory. Some primers have a harder cup than others. If you have your factory firing pin assembly, put it back in the bolt body and try another round. If it works, you know the problem.

    Jayson
     
    Last edited: Sep 12, 2019 at 11:44 AM
  9. Triple BB

    Triple BB Well-Known Member

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    Nothing cheap about Remington 300 RUM brass. It’s great brass and you’re going to pay for it if you can find it...
     
  10. Ross1147

    Ross1147 Well-Known Member

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    I’ve had this happen before with brass I accidentally bumped the shoulders back on too far. I measured an already sized case and bumped the shoulder back thinking it was a fired one. The bolt was a PTG bolt and seems to have a pretty strong firing pin spring and no issues with protrusion. It shot all properly sized brass with no issues, so I chalked it up to a head spacing issue with the brass I messed up. Not saying you did this but I’d check the shoulders on the brass against a fired round again.
     
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  11. laker

    laker Well-Known Member

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    If it’s a tubbs speed lock setup I had two of them weaken and do just what yours is doing
     
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  12. tugger

    tugger Member

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    Thanks to all of you that took the time to reply, much appreciated! So I removed and cleaned up the firing pin and bolt, with exactly the same results. Next I swapped another firing pin from another model 700 same results again. So it wasn’t a dirty pin or bad spring. Then I pulled the bullets and measured the misfired cases, turns out that they were .010 back from a fire Formed cases, instead of .002! For the life of me I can’t figure out how the hell I did that!
    To be honest I am quite surprised that only .010 would cause a miss fire! Looks like I did the same thing as Ross1147 (only worse)
    It seems like Ten Thou isn’t very much tolerance, but I hope it’s the problem. For now I will just neck size and see if the miss fires stop, and not bump back on till absolutely Need to.
    So what do you guys think?
    Thanks again for your help.
     
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  13. MagnumManiac

    MagnumManiac Well-Known Member

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    My RUM IS also built on a Rem 700 action, started life as a Sendero II in 300RUM, I got for a steal.
    The shoulder location is critical on these, so neck sizing will bring the brass back to spec, but I would check on the subsequent firing for incipient case head separations.

    Your load seems very mild, of late I have been using US869, RE33 & RETUMBO in mine, much better results than H1000 so far.
    Am experimenting with H50BMG at the moment, very high velocity with lower pressure than the other powders mentioned. Accuracy is so-so as I am just working on pressures over the pressure trace and what velocity/pressure window gives the lowest ES.

    Cheers.
     
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  14. Rhovee

    Rhovee Well-Known Member

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    Jam the bullets on the cases that are sized to much. .020 in the lands. this will bolt the case head tight to the firing pin.
     
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