Pennsylvania Firearm Owners Association
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  1. #1
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    Default .224 With 14" Twist

    What's been your experience with heavier bullets in a 14" twist?

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    Default Re: .224 With 14" Twist

    I used an early m16 (serial number 609) at a machine gun training class at Fort Dix in Feb. Temps were around 0 degrees and m193 ball ammo was keyholing at 25 meters.
    The gun shot fine in warmer temps. 1/14 is not a good choice for anything over about 40 grains.
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    Default Re: .224 With 14" Twist

    Have a 22/250, 1-14, that took me down the rabbit hole finding what I wanted.
    That 22/250, with my loads, would shoot some 55's maybe ok, and others poorly. Over that was a real crap shoot.
    I took conventional wisdom of certain weights for certain twists a step further.
    I learned that weight was only one consideration.
    A few decent articles on it: http://bulletin.accurateshooter.com/...&submit=Search
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    Default Re: .224 With 14" Twist

    As Cephas alluded to in the thread above, it's length, not mass of the bullet, but the mass and length are tied together by the diameter of the bullet. However, where the mass is distrubuted within the long axis of the bullet can make a difference, too. For example, a hollow point with the mass concentrated at towards the rear may tend to be unstable if the rifling twist is too slow.

    IME, 40 gr and some 45 gr .224 bullets shot fine in 1:14 twist. I could not get 50s or 55s to do so.

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    Default Re: .224 With 14" Twist

    Hyper-velocity .224 chamberings typically have 1:14" twist. .220Swift, .22-250, .225Win, .224Wby, etc.

    Their velocity makes up for the slower twist with most bullet lengths.

    Two things determines proper twist rate: bullet length and velocity. Slower of a given length bullet, the faster you must spin it. The faster you push it, the less twist you need.

    If your gun is chambered in .222Rem, .222RemMag, .223Rem, or some other "slower" cartridge, you'll probably be limited to 50-55gr bullet lengths or less due to velocity. If one of the hyper-velocity cartridges, you may find that the 69-72gr lengths do just fine.
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  6. #6
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    Default Re: .224 With 14" Twist

    Just look at the history of the 6MM Remington and you will understand. I got a cheap .244 Remington barrel and put it on an Arisaka action. I had to load 100 grain RN flat based bullets to get it to "Deer accuracy" at 100 yards.

  7. #7
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    Default Re: .224 With 14" Twist

    Yeah, works the same way with Speer's .224 diameter 70 grain round nose.

  8. #8
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    Default Re: .224 With 14" Twist

    Quote Originally Posted by cephas View Post
    Have a 22/250, 1-14, that took me down the rabbit hole finding what I wanted.
    That 22/250, with my loads, would shoot some 55's maybe ok, and others poorly. Over that was a real crap shoot.
    I took conventional wisdom of certain weights for certain twists a step further.
    I learned that weight was only one consideration.
    A few decent articles on it: http://bulletin.accurateshooter.com/...&submit=Search
    Yeah, I have a 22-250 and use 50g TNT and it works fine. Never tried anything heavier though.

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    Default Re: .224 With 14" Twist

    Quote Originally Posted by Hib View Post
    What's been your experience with heavier bullets in a 14" twist?
    They tumble. You will see keyholes in targets.


    I would start to notice it when I reloaded at above 70 grains of weight, at about 2300 feet per second.


    I agree with our friend above - muzzle velocity and barrel twist rates are interrelated.

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    Default Re: .224 With 14" Twist

    Quote Originally Posted by cdi View Post
    I used an early m16 (serial number 609) at a machine gun training class at Fort Dix in Feb. Temps were around 0 degrees and m193 ball ammo was keyholing at 25 meters.
    The gun shot fine in warmer temps. 1/14 is not a good choice for anything over about 40 grains.
    Heard that too. The US Army did not care for subzero performance of the original M16. Accuracy and stability suffered.

    The HK series of firearms kept the 1/14 twist. The Germans wanted to retain lethality. They would later adopt the "spoon point" bullet for the G36 prototypes in the 1970s. Something to do with an analysis of small arms strikes - they noted that most people were struck in the arms and legs. So they wanted more "effectiveness". Germans take warfare seriously.

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