What are these markings?

Discussion in 'General Firearm Discussion' started by Kevatc, Sep 19, 2011.

  1. Kevatc

    Kevatc
    Oregon
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    Found a handful of .308 brass (and one round) all with these markings on the case. All had the same headstamp. Anybody fill me in on what I am looking at?

    DSCN3740.jpg
     
  2. coop44

    coop44
    Tacoma ,WA
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    a fluted chamber as what is used in HK rifles, probably others, Aids in extraction as powder fouling generally falls between the flutes. A thoughtful combat option.
     
  3. halmbarte

    halmbarte
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    HK type rifle.

    The flutes float the brass so it doesn't stick to the chamber. Needed as the roller delayed blowback system that rifle uses starts unlocking while the chamber pressure is very high. W/o the flutes the extractor would rip the head off the case.

    H
     
  4. gnarl

    gnarl
    Sequim, WA
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    Very strange...like someone tried to fire a .308 in an 30-06?
     
  5. RockKrawler

    RockKrawler
    Gresham
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  6. Abiqua

    Abiqua
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    That's what brass from my HK91 looks like. Throws it a good 30+ feet.
     
  7. Kevatc

    Kevatc
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    So, no way this could be a bolt gun kind of thing?
     
  8. halmbarte

    halmbarte
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    Nope. Not unless some pinhead with more time and money than good sense got aholdt of a G3 barrel and welded a bolt action onto the end of it.

    No reason to do this with a bolt action. On a bolt gun, or any other rifle that actually locks the bolt to the barrel, you let pressures drop so that the brass isn't ripped in half during primary extraction. Delayed blowback weapons start extracting while the brass is still pressurized and require flutes, greased, waxed, or lubricated ammo to handle the forces.

    H
     
  9. Kevatc

    Kevatc
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    Thanks! Learn something new everyday! One more question .... lubed ammo. Never heard of that. Is that a thing unique to HK type guns? Is it a practical type military idea or is it more of a civilian thing? Sorry, more than one question there. :confused:
     
  10. Spadkarma

    Spadkarma
    South Lake Whatcom
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    That's why some people refer to G3s and clones as "Brass Rapers".
     
  11. moose

    moose
    northwet coast
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    Looks like to me, it makes for a very dirty chamber.
     
  12. Redcap

    Redcap
    Lewis County, WA
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    Nope. Definitely a HK rifle.
     
  13. civilian75

    civilian75
    Hillsboro, OR
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    +1 HK/CETME/SMG. Cases where fired by a delayed blowback rifle with flutted chambers. I once tried to re-size a 7.62Nato LC range pick-up case, just out of curiosity. I had just stater reloading. It was, as the Japanese say, "very difficult".
     
  14. halmbarte

    halmbarte
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    HKs don't require lubed ammo as the chambers are fluted. Some other weapons used ammo that has waxed cases or even little oil pumps to spray oil on the ammo or in the chamber. One of the Jap MGs from WWII had a little oil reservoir with a brush that applied oil to the incoming rounds.

    Generally speaking, requiring ammo to be lubed is a good sign the designing engineer isn't as clever as he thinks he is.

    H
     

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