10mm Factory Ammo Brass Cracking! Need help - Page 5
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Thread: 10mm Factory Ammo Brass Cracking! Need help

  1. #41
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    Time for professional help! It’s now in MM’s hands trusting he will figure this out & get my CA running flawlessly.

  2. #42
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    Quote Originally Posted by kwesi View Post
    https://i.postimg.cc/43VMVfhz/8-C2-F...157-A5-FE4.jpg

    Coharie CA89-10 with:
    Michael Machines barrel
    RCM Trunnion
    HK German complete bolt & carrier
    Aftermarket A3 stock with HK buffer
    Hi LP
    HK recoil rod
    HK German mags
    Bolt Gap .010-.011”
    Sellier & Bellot 180 gr FMJ
    NOTE: S&B has started a case to determine why much of their brass is splitting.

    I had a single FTE on round #4 on semi then she purred thru the next 120 rounds semi & FA. I switched to my Blackthorne stock ( that I’ve mostly used over the years) & FTE’s started. Put the A3 on then several FTE’s as well. Replaced the extractor & extractor spring with HK parts & no help. I called it a day. I’m open to suggestions.
    The cases in your picture are very clean and I would say you cleaned them after firing so the splits would be more visible?
    Otherwise, where are the flute marks? Apologies if this has been asked/answered.

  3. #43
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    I have never seen whole batch of bullets be faulty like that one maybe 2 is pushing it but that many..... maybe I am wrong but I would make sure ur barrel is up to spec


    Sent from my iPhone using Tapatalk

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  5. #44
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    bitsy: I did not clean the brass.

  6. #45
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    Mike916: I’ve never had a split case on the first firing of a factory or my own loads.

  7. #46
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    Update: I can’t begin to tell you what a pleasure it has been communicating and doing business with Mike Otte! Mike determined the following: 1) the bolt was hitting the trunnion causing a slight shift which has been beating the bolt 2) a spot in the left side of the trunnion & inside of it was removed 3) my receiver rails were not properly aligned with the trunnion. Mike was able to straighten them. 4) my extractor had some movement so he replaced the extractor spring. He tested & bolt no longer hits trunnion. I then replaced the beat up ejector (see above) and took her to the range today. I put the A3 stock on and proceeded to load 25 rounds of each of the following: (all 180 FMJ & Hi-LP):
    Sig factory
    9.1 gr Longshot
    8.7 gr Longshot
    8.0 gr Power Pistol
    S&B (same lot with split cases)
    10.5 gr Blue Dot

    All ran 100%! Thanks Mike!! I received World Class Service with great communication and a more than fair price!
    Last edited by kwesi; 09-18-2019 at 03:01 PM.
    Tailflash likes this.

  8. #47
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    S&B Ammo Update: they replaced the Ammo I returned with a different lot. I test fired 200 rounds. I was able to retrieve 113 and only had 1 split case!

  9. #48
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    good to see you're back in business

  10. #49
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    So was the problem ultimately with the trunnion install?
    JetRanger

  11. #50
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    Jet: hard to know. Even though Mike Otte fixed a spot in the trunnion & squared up my rails, he said he felt it was bad brass. All of the Ammo he test fired had no splits & basically looked the same as if fired in his HK MP5-10. Bottom line: I’ve been on cloud 10. My gun has never run like this! I chose to add +4 rollers. My BG has held at .014 now after firing 300+ rounds. Thanks again Mike!

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