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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
my method
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<blockquote data-quote="esshup" data-source="post: 247664" data-attributes="member: 11101"><p>First off, I want to clarify that I'm not taking any "side", I am just posting this to hopefully learn something.</p><p> </p><p>I see a reference to RPM, and bullet impact speeds in the testing. From my way of thinking, if the guns that are used to test the bullets have the same rate of twist, and the impact speeds are the same, then the RPM should be the same as well, correct?</p><p> </p><p>Here's the way that I look at it.</p><p>Speed won't change the rotation of the bullet if the bullet is fired from barrels with the same rate of twist. (lets take gain twist barrels out of this equasion) 1 revolution in 10" is 1:10 no matter how fast the bullet is thrown. Yes, the RPM will change, but it only changes if the impact distance changes as well. (I'm also discounting any "skidding" of the bullet in the bore.)</p><p> </p><p>I realize that the rotation of the bullet will have some effect on how the bullet expands, but has anybody been able to test and document just how much of an effect it actually does have?</p><p> </p><p>Or should the term RPM be changed to RPD (revolutions per distance) when talking about bullet spin?</p></blockquote><p></p>
[QUOTE="esshup, post: 247664, member: 11101"] First off, I want to clarify that I'm not taking any "side", I am just posting this to hopefully learn something. I see a reference to RPM, and bullet impact speeds in the testing. From my way of thinking, if the guns that are used to test the bullets have the same rate of twist, and the impact speeds are the same, then the RPM should be the same as well, correct? Here's the way that I look at it. Speed won't change the rotation of the bullet if the bullet is fired from barrels with the same rate of twist. (lets take gain twist barrels out of this equasion) 1 revolution in 10" is 1:10 no matter how fast the bullet is thrown. Yes, the RPM will change, but it only changes if the impact distance changes as well. (I'm also discounting any "skidding" of the bullet in the bore.) I realize that the rotation of the bullet will have some effect on how the bullet expands, but has anybody been able to test and document just how much of an effect it actually does have? Or should the term RPM be changed to RPD (revolutions per distance) when talking about bullet spin? [/QUOTE]
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