Can a 1-10" twist barrel in .224 cal stabilize the Amax 75 grn?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Jesse Jaymes, Jan 11, 2005.

  1. Jesse Jaymes

    Jesse Jaymes Active Member

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    Can a 1-10\" twist barrel in .224 cal stabilize the Amax 75 grn?

    Contemplating getting a new rifle. Already have 22-250's and 223's. Want to shoot the 75 Amax fast. Winchester has their rifles built with 10 twist in 223 WSSM. Any guess if ti will stabilize these bullets?
     
  2. Guest

    Guest Guest

    Re: Can a 1-10\" twist barrel in .224 cal stabilize the Amax 75 grn?

    I have been doing research into building a 22/6mm for about 12 months and am currently finalising on the reamer specs.
    I expect 75 gr AMax to run about 3700 - 3800 fps with 27" barrel.
    Twist required with these velocities for 75 AMax is 1/9 from all reports. 80gr SMK also will be trialled which really need a 1/8 so I split the difference 1/8.5 twist.

    At the velocities a 223 WSSM will reach [slower]compared to the 22/6mm and 75 AMax I suggest you need at least 1/8.

    APB
     
  3. Varmint Hunter

    Varmint Hunter Well-Known Member

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    Re: Can a 1-10\" twist barrel in .224 cal stabilize the Amax 75 grn?

    I shoot the 75gr A-Max from a 22-243AI. Velocity is 3,670 ft/sec from the 28" Hart barrel. Although my barrel shoots quite well with the 8 twist, the 9 twist is adequate.

    The 9 twist should also be adequate for .223, 22-250, 220swift, etc.
     
  4. goodgrouper

    goodgrouper Well-Known Member

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    Re: Can a 1-10\" twist barrel in .224 cal stabilize the Amax 75 grn?

    When those bullets first came out, they said right on the box to use in 1-8" twist barrels. Now they say 1-9". I have a few of the 8's left and they measure the same in every way to the 9's. I bet that they will work ok in a 10" twist if the velocity is there and the air is thin and warm. Using a 28" barrel, a 22-250 improved will push them in the velocity range you are looking for while burning a little less powder than the 22-6mmAI and the 22-243AI. Just something to think about. /ubbthreads/images/graemlins/smile.gif
    P.S. You might also want to run a 6 or 8 groove barrel to shoot that Amax as it seems to be easier on the jacket of that fragile Hornady. Fifty driver and I had an interesting conversation on that topic, and we both thought there might just be something to it!