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Thread: Any reason not to use a 1/12 twist 16" barrel if limited to M193?

  1. #31
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    Quote Originally Posted by TED View Post
    If I built an AR that would be fed EXCLUSIVELY with M193 is there any reason I should NOT use a 1/12 twist 16" barrel?

    Is there any benefit to doing so, such as possible increase in velocity or terminal effect?
    I don't think it makes much difference in practical terms.

    In a 14.5-inch twist M16A1 carbine barrel you still got at least one full twist before the round leaves the muzzle. I've shot tens of thousands of M193 and commercial 55-grain rounds out of 1-7 twist 14.5 carbines as well as the old 1-12 twist M16A1 carbine.

    I shot out at least one 1-9 twist carbine (I don't remember the brand) with M193 and commercial 55s.

  2. #32
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    Quote Originally Posted by lysander View Post
    A regular child's top spun by hand and spinning on a table top, takes about 5 to 10 seconds before it shows signs of instability. So accounting for the difference in angular moment of inertia, angular speeds and drag from the table, the average bullet will probably remain stable for 5 to 6 seconds when spun at 180,000-200,000 rpm.

    So, how far will a bullet go in 5 to 6 seconds?
    Was it an African Swallow?
    11C2P '83-'87
    Airborne Infantry
    F**k China!

  3. #33
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    M16A1 shooting 55s, somewhere between 1500 and 1700 yards.

    A1 Table.jpg

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