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Rifles, Reloading, Optics, Equipment
Reloading
Ballistic Coefficient (BC)
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<blockquote data-quote="Rogue" data-source="post: 125833" data-attributes="member: 6642"><p>The Nosler Reloading Guide defines BC as "The ratio of a bullet's sectional density to its coefficient of form, used to describe the bullet's effectiveness in overcoming air resistance during flight."</p><p></p><p>Sectional Density - "The ratio of a bullet's weight, in pounds, to the square of its diameter, in inches."</p><p></p><p>Coefficient of form - Not defined.</p><p></p><p>If I understand BC correctly, a higher the BC:</p><p>1. Allows a truer flight path as the bullet passes through air with less resistance.</p><p>2. Allows a flatter trajectory as velocity is increased due to less resistance.</p><p>3. Allows the bullet to impact with increased energy due to increased velocity. </p><p></p><p>What I don't understand is how factors like materials and design are calculated into BC. How do metals like lead, copper and steel effect BC? How does a hollow point(SMK) or a delrin tip(Barnes X) effect BC? How does lead placement with in the bullet (some have lead throughout some have lead in the base) effect BC?</p><p></p><p>Where do bullet makers list the equations or test results that determine BC?</p><p></p><p>Rogue</p></blockquote><p></p>
[QUOTE="Rogue, post: 125833, member: 6642"] The Nosler Reloading Guide defines BC as "The ratio of a bullet's sectional density to its coefficient of form, used to describe the bullet's effectiveness in overcoming air resistance during flight." Sectional Density - "The ratio of a bullet's weight, in pounds, to the square of its diameter, in inches." Coefficient of form - Not defined. If I understand BC correctly, a higher the BC: 1. Allows a truer flight path as the bullet passes through air with less resistance. 2. Allows a flatter trajectory as velocity is increased due to less resistance. 3. Allows the bullet to impact with increased energy due to increased velocity. What I don't understand is how factors like materials and design are calculated into BC. How do metals like lead, copper and steel effect BC? How does a hollow point(SMK) or a delrin tip(Barnes X) effect BC? How does lead placement with in the bullet (some have lead throughout some have lead in the base) effect BC? Where do bullet makers list the equations or test results that determine BC? Rogue [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ballistic Coefficient (BC)
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