300 blk case damage

Discussion in 'Reloading and ammunition' started by Lrtx1, May 22, 2017.

  1. Lrtx1

    Lrtx1 LSB Member

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    Yall know what would cause this?
    [​IMG]

    New build, shot 20 rounds of factory Hornady ammo. Over half the rounds have gouges on each side of the primer. Hard to get a pic that shows the damage well. Gouges leave sharp edges that you can feel. Also, leaving brass shavings in bolt face.

    Brass ejects at 3 o clock, throws it about 7 feet. Pistol length gas system, 16" barrel.
     
  2. FrankT

    FrankT Destin FL LSB TURKEY BUZZARD PRESERVATION SOCIETY LoneStarBoars Supporter

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    why pistol gas with a 16" barrel should be a mid gas...if carbine gas is harsh I can only imagine a pistol gas
     
  3. Lrtx1

    Lrtx1 LSB Member

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    I figured there were quite a few 16" barrel with pistol length gas for sale it must work.

    I'm going to take a bcg out of my other rifle and run it in this one and see if it does the same thing.
     
  4. FrankT

    FrankT Destin FL LSB TURKEY BUZZARD PRESERVATION SOCIETY LoneStarBoars Supporter

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    I have never heard anyone ever running that combo, sorry
     
  5. pruhdlr

    pruhdlr Cantonment,Fla. SUS VENATOR CLUB

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    Hmmmmmm . . . . does not look like the typical ejector plunger marks either.
    Maybe marks made by the extractor . . IF . . the brass turned on the bolt face.
    Could be marks made by a magazine. But only if the round traveled rearward after it's possible forward travel due to recoil. Maybe drop a single round into the chamber and fire it to see if it has these marks. Some mags hold the top round tight but the ones under it are somewhat loose. --- pruhdlr
     
  6. der Teufel

    der Teufel Livin' the Dream … SUS VENATOR CLUB

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    Pistol length gas systems with 16 inch barrels is common for 300 BLK. It helps when using subsonic ammo.
     
    pruhdlr likes this.
  7. FrankT

    FrankT Destin FL LSB TURKEY BUZZARD PRESERVATION SOCIETY LoneStarBoars Supporter

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    Really? That is pretty strange..Thanks for the info
     
  8. Lrtx1

    Lrtx1 LSB Member

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    So, I added a little weight to the buffer. Somewhat resolved the issue. Only marks 25% of the brass now instead of 75%. I did notice a lot less ping in the buffer tube.

    Adjustable gas block is probably in my future.
     
  9. pruhdlr

    pruhdlr Cantonment,Fla. SUS VENATOR CLUB

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    Sooooooo . . . . . . . . what was leaving them marks. Ejector plunger,dirty/uneven bolt face,etc ?? --- pruhdlr
     
  10. Lrtx1

    Lrtx1 LSB Member

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    Leaning towards over gassed. Didn't switch bolts to be sure yet. Will get that done this weekend.
     
  11. ZenArchery

    ZenArchery LSB Active Member SUS VENATOR CLUB LoneStarBoars Supporter

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    Ejector marks. My 6.5 makes them on the soft Hornady brass. Just spin your brass a little longer then normal and it polishes them out. I'm on 5th run with the brass. No issues. Outside of annoying marks.
     

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