Bullet ''spin''

This is a discussion on Bullet ''spin'' within the General Firearm Discussion forums, part of the Related Topics category; Originally Posted by rocky Thought I read about .223 bullets fragmenting before impact thru some AR's. Apparently, the really light, ultra-high velocity varmint rounds (40 ...

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Thread: Bullet ''spin''

  1. #16
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    Quote Originally Posted by rocky
    Thought I read about .223 bullets fragmenting before impact thru some AR's.
    Apparently, the really light, ultra-high velocity varmint rounds (40 and 45 gr) shot out of a 1:7 twist will tear themselves to pieces shortly after leaving the muzzle.

    OTOH, the longer, heavier 77gr ammo won't stay stable beyond 90 or so yards out of the slow 1:12 barrels.

    Fascinating stuff.

    Matt
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  3. #17
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    Thanks Matt, I couldn't remember exactly what I had read on it.
    "In matters of style, swim with the current; in matters of principle, stand like a rock." Thomas Jefferson


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  4. #18
    Senior Member Array KC135's Avatar
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    Quote Originally Posted by QKShooter
    June - SHOOTING TIMES had an article on bullet spin.

    Didja know that a 1:14" twist gives a bullet 144,000 rotations per minute & a 1:7" twist more than doubles it to 308,523 RPM

    A table saw blade rotates a 3,000 RPM...so them there bullets are really spinning.
    Even at 1000fps, it only has 2.4 rotations in 12". Not exactly like a table saw ripping a 12" cut.
    Keep the shotgun handy!!

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