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Polygonal rifling, pros, cons, and anything else...?

Discussion in 'General Gun Discussions' started by gvnwst, Feb 18, 2009.

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  1. gvnwst

    gvnwst Member

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    Basically as the title says, i just learned about polygonal type rifling, and it looks like good. But are there any cons, other than cost maybe, that make "regular" rifling better? Is it actually more accurate than standard rifling? Seems like with that, and the claimed extra veli=ocity, it would be a good choice for LR rifles...

    For those of you who haven't seen what it is, here is a basic photo:
    [​IMG]
     
  2. chris in va

    chris in va Member

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    The only two things I can tell you is don't shoot 'bare' lead bullets through it, and it's easier to clean.
     
  3. Carlos Cabeza

    Carlos Cabeza Member

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    HAHA ! So that's what polygonal rifling looks like !:neener: I am suddenly glad I don't own an uberpistole...............
     
  4. geronimo509

    geronimo509 Member

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    my kahr mk9 is very accurate and it has polygonal rifling.
     
  5. Bobarino

    Bobarino member

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    polygonal is supposed to give a tiny increase in velocity due to a better seal between the barrel and bullet. it is easier to clean, that's for sure.

    you'll be hard pressed to find a barrel maker that will do it. H&K used to do some of their rifles with polygonal rifling, but they haven't in quite a while. i don't know of any others that do it, but then again, i haven't looked either.

    Bobby
     
  6. Kurt_D

    Kurt_D Member

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    Pac-nor or Noveske if you have an AR and they ain't cheap. I have a Noveske on my AR10, it's a tack driver and easy to clean; there doesn't seem to be a lot of copper build up with this type of rifling.
     
  7. Rembrandt

    Rembrandt Member

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    My Desert Eagle and HK rifle has polygonal rifling.....wish everyone offered it. Easy to clean and accurate.
     
  8. taliv

    taliv Moderator

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    where'd you get that pic, gvn? 8 lands?
     
  9. Claude Clay

    Claude Clay Member

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    the pic on the left started life as a loc-washer
     
  10. blkbrd666

    blkbrd666 Member

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    The little CZ surplus has it...CZ82? I think Glocks have it don't they?
     
  11. fecmech

    fecmech Member

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    I put a little over 3500 rds of cast lead through my K-9 Khar Polygonal barrel. Very accurate and no leading or pressure problems while duplicating jacketed ballistics.
     
  12. Jorg Nysgerrig

    Jorg Nysgerrig Member

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    Taliv, that picture is from the Wikipedia article on rifling. I don't where the original source.
     
  13. Howard Roark

    Howard Roark Member

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    While not polygonal per say, Broughton makes some of the finest rifle barrels one can get. They call it a "canted" land and their track record cannot be disputed.

    The above is cut and pasted from my reply in a thread on .us
     
  14. Javelin

    Javelin Member

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    Noveske makes stainless polygonal rifled barrels that add 20-40fps to the bullet. And they are very accurate.

    The only polygonal rifled barrel I personally own is in my Glock.

    :)
     
  15. gvnwst

    gvnwst Member

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    So, other than cost, nobody knows any downsides of this type of rifling?

    Howard--thanks for the link, is the 5c (5 canted? I have always understood it to be a special rifling shape, like a boxy C....) the stuff you were talking about? I really like the Broughton barrels i have seen, I would love to put one on a custom LR savage or remmy 700....
    taliv--Jorg is correct, the pic is from wikipedia...:uhoh::D
     
  16. Howard Roark

    Howard Roark Member

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    Yes, 5C is what I was refering to. I know several high power shooters that like the .243 but don't care for the short barrel life a .243 has. The Broughton barrels give higher velocities and when used with moly, barrel life is extended 1000 to 1200 more rounds than with naked bullets.
     
  17. gvnwst

    gvnwst Member

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    Cool, so for bolt guns, Broughton is the *best* (for now i guess) and for ARs, Noveske makes polygonal rifling......food for thought.:D

    Does the 5c rifling have anything, or is it missing anything over "actual" polygonal rifling? Or are they so similar that it doesn't matter?
     
  18. LoneCoon

    LoneCoon Member

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    I could be totally off base here, but when you have a hammer forged barrel, wouldn't it be easier to use polygonal rifling? Or is that what they do anyway?
     
  19. Howard Roark

    Howard Roark Member

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    I don't know if I'd hang the *best* tag on any particular barrel, rifling method or profile. All the big boy tube carvers have plenty of accolades for their respective barrels. I guess its a good thing that there are so many good barrel makes out there because 2 or 3 couldn't keep up with demand.

    I think what is refered to as polygonal rifling is more like the picture you posted. Very gradual transition from the lands to grooves. The rifling is more pronounced with 5C.
     
  20. Jim K

    Jim K Member

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    It is easier to make by hammer forging; less pressure is needed since the barrel steel doesn't have to be forced into sharp corners.

    In theory, it should be less effective as a bullet guide, but in practice there seems to be little difference in accuracy, both barrels being of equal quality.

    Jim
     
  21. Howard Roark

    Howard Roark Member

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    I find it very interesting and telling that the top European rifle barrel manufacturers don't use hammer forging. Grunig-Elmiger, Anschutz, Lothar Walther and Border all use or only make cut or button rifled barrels. American companies follow suit.
     
  22. rbernie
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    rbernie Member

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    I thought that the Sako/Tikka barrels were hammer forged, and highly thought of....

    ??
     
  23. Howard Roark

    Howard Roark Member

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    I guess that depends on the thinker and what they are doing with it. Has anything ever been won using a hammer forged barrel? Here are three of the top rifle builders for the F-Class shooters in the UK; RG Rifles, HPS, Osprey. Not a single one of them uses hammer forged barrels. Not to mention Grunig-Elmiger, Anschutz, Lothar Walther, FWB.

    I am not saying hammer forged barrels don't have their place but winning matches ain't it.
     
  24. Blakenzy

    Blakenzy Member

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    Why can't you use bare lead bullets in polygonal rifled barrels?
     
  25. Pulse

    Pulse Member

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    i am absolutly sure that Tanner is useing cold hammer forged barrels made by SAN for his rifle and those are among the very very best you can get for ISSF or CISM competition.

    the problem with cold hammer forging is that you need a machine that costs a couple millions, something most small gunsmiths will never be able to afford.
     
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