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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet failures
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<blockquote data-quote="Petey308" data-source="post: 2414194" data-attributes="member: 106845"><p>If there is less contact surface, there will be less deflection and alteration of its course, especially if the frontal area remains rounded and evenly shaped, like if it sheds all its petals and is left only with a shank remaining. If only one petal remained, that remaining petal would cause the bullet to alter its course, sometimes drastically- same as if the whole bullet started turning and tumbling without expansion.</p><p></p><p>Tipping in flight doesn't just come from reduced RPMs, it comes from the center of pressure sliding back to or behind the center of gravity of the bullet, which causes the nose to tip and allow the bullet to begin to tumble.</p><p></p><p>Shedding weight will allow the bullet to also shed momentum and velocity and that in turn will increase the penetration up to the point in can no longer overcome the resistance it is encountering. This is why starting with a good deal of sectional density (mass) is ideal with a bullet that sheds weight. You want enough of the bullet remaining to continue to penetrate. A heavier bullet that does not expand but also does not penetrate deeply typically does so because it tumbled upon impact and increased its contact surface to the point its forward momentum is indeed arrested and it stops penetrating. Coming apart and reducing contact surface would allow for more/deeper penetration.</p></blockquote><p></p>
[QUOTE="Petey308, post: 2414194, member: 106845"] If there is less contact surface, there will be less deflection and alteration of its course, especially if the frontal area remains rounded and evenly shaped, like if it sheds all its petals and is left only with a shank remaining. If only one petal remained, that remaining petal would cause the bullet to alter its course, sometimes drastically- same as if the whole bullet started turning and tumbling without expansion. Tipping in flight doesn’t just come from reduced RPMs, it comes from the center of pressure sliding back to or behind the center of gravity of the bullet, which causes the nose to tip and allow the bullet to begin to tumble. Shedding weight will allow the bullet to also shed momentum and velocity and that in turn will increase the penetration up to the point in can no longer overcome the resistance it is encountering. This is why starting with a good deal of sectional density (mass) is ideal with a bullet that sheds weight. You want enough of the bullet remaining to continue to penetrate. A heavier bullet that does not expand but also does not penetrate deeply typically does so because it tumbled upon impact and increased its contact surface to the point its forward momentum is indeed arrested and it stops penetrating. Coming apart and reducing contact surface would allow for more/deeper penetration. [/QUOTE]
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