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This is a discussion on Bullet RPM... within the Accuracy forums, part of the M14 M1A Forum category; To All, My understanding (and backed up by APG) is that rotational velocity and linear velocity are not linked. The rotational spin will slow somewhat ...


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Old January 26th, 2017, 02:07 PM   #31
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My understanding (and backed up by APG) is that rotational velocity and linear velocity are not linked. The rotational spin will slow somewhat once you get out past 1000 meters, but it is a very minor amount. So if you start a bullet out in a 1-12" twist barrel, it will rotate once every 12" of linear flight regardless of velocity.

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Old January 26th, 2017, 02:18 PM   #32
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Originally Posted by DstRflMn645 View Post
To All,
My understanding (and backed up by APG) is that rotational velocity and linear velocity are not linked. The rotational spin will slow somewhat once you get out past 1000 meters, but it is a very minor amount. So if you start a bullet out in a 1-12" twist barrel, it will rotate once every 12" of linear flight regardless of velocity.

John

They are not directly linked but are two components of a bullet's physical performance from "internal" to "terminal" ballistics.

Both linear and rotational velocities diminish with distance from the muzzle, primarily due to atmospheric resistance (air density). Rotational velocity comes into play as it being a factor in the vertical component of wind drift.


Last edited by DudleyDR; January 26th, 2017 at 02:34 PM.
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Old January 26th, 2017, 02:52 PM   #33
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