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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Improved Stability Formula for Plastic Tipped Bullets
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<blockquote data-quote="Michael Courtney" data-source="post: 738799" data-attributes="member: 28191"><p>It depends on what is held constant. Your comments make sense if you are adding a plastic tip to a bullet, thus making it longer.</p><p></p><p>My comments make sense with respect to the stability formulas. The total length of the bullet is the total length. The plastic tip is part of the total length, thus violating the assumption in the original Miller twist rule that the bullet has constant density. The center of gravity is moved backward (compared with a bullet of constant density) and the tumbling moment of inertia is reduced. Stability is increased relative to a constant density bullet of the same dimensions. </p><p></p><p>Find the Jan and Feb 2012 articles in Precision Shooting, they should clarify things.</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 738799, member: 28191"] It depends on what is held constant. Your comments make sense if you are adding a plastic tip to a bullet, thus making it longer. My comments make sense with respect to the stability formulas. The total length of the bullet is the total length. The plastic tip is part of the total length, thus violating the assumption in the original Miller twist rule that the bullet has constant density. The center of gravity is moved backward (compared with a bullet of constant density) and the tumbling moment of inertia is reduced. Stability is increased relative to a constant density bullet of the same dimensions. Find the Jan and Feb 2012 articles in Precision Shooting, they should clarify things. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Improved Stability Formula for Plastic Tipped Bullets
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