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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="Catfur" data-source="post: 738831" data-attributes="member: 41271"><p>The gyroscopic stability of anything (including a bullet) is based on the rotational momentum. Rotational momentum is Iω, that is moment of inertia x angular velocity. The moment of inertia is affected more by the mass of the object that is farther away from the axis of rotation than by mass that is near the object of rotation (and the relationship is based on distance squared). </p><p></p><p>For a given weight bullet, an FMJ has more of the total mass nearer the axis of rotation than a hollowpoint or plastic tipped bullet. The hollowpoint or plastic tip displaces the lead that is usually located at the point, and distributes it out farther away from the axis. This increases the moment of inertia (I) and thus allows the same rotational momentum to be achieved with lower angular velocity (ω).</p></blockquote><p></p>
[QUOTE="Catfur, post: 738831, member: 41271"] The gyroscopic stability of anything (including a bullet) is based on the rotational momentum. Rotational momentum is Iω, that is moment of inertia x angular velocity. The moment of inertia is affected more by the mass of the object that is farther away from the axis of rotation than by mass that is near the object of rotation (and the relationship is based on distance squared). For a given weight bullet, an FMJ has more of the total mass nearer the axis of rotation than a hollowpoint or plastic tipped bullet. The hollowpoint or plastic tip displaces the lead that is usually located at the point, and distributes it out farther away from the axis. This increases the moment of inertia (I) and thus allows the same rotational momentum to be achieved with lower angular velocity (ω). [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Improved Stability Formula for Plastic Tipped Bullets
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