Variable rifeling rifle barrels...... ?

Discussion in 'General Discussion' started by glocknut, Mar 2, 2004.

  1. glocknut

    glocknut New Member

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    I was looking at a friends magazine called Competitive Shooting (?) and saw an ad for a barrel maker that makes a barrel that starts out at something like a 1/12 twist and increases to a 1/7 twist at the muzzle end.....

    The add said that this increases accuracy and makes more use of the powder charge by increasing veloctiy?


    Anyone ever seen this type of barrel?
    I don't know if it'd be necessary for an AR but it might be good for a bolt action? One of my pet projects is a .300 win mag with all of the goodies......this might be a good deal for it?

    mike
  2. Xracer

    Xracer *TFF Admin Staff Mediator*

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    Minn-eeee-sota, ya, sure, you bet!
    Since the stability of a bullet is determined by the rotational twist as it leaves the barrel, I fail to see how an increasing twist as it travels through the barrel would have any advantage over a constant rotational twist.

    After all.....the final rotation is the same where it counts....at the exit.
  3. glocknut

    glocknut New Member

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    I dunno.....

    Thought the diagram looked cool anyway....

    mike
  4. armedandsafe

    armedandsafe Guest

    My understanding is that gain twist rifling produces less stress on the bullet, therefore you can have a higher final rotation speed AND a higher velocity without stripping the jacket.

    Pops
  5. glocknut

    glocknut New Member

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    Yeah....thats it!!

    mike
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