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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
sectional density's effect on bullet performance
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<blockquote data-quote="MAX" data-source="post: 28102" data-attributes="member: 184"><p><strong>Re: sectional density\'s effect on bullet performance</strong></p><p></p><p>sscoyote, SD or sectional density is a measure of mass to cross section of a projectile. For a given caliber, higher SD means greater penetration IF ALL OTHER THINGS ARE EQUAL.</p><p></p><p>SD is used to calculate ballistic coefficient(BC). BC is a measure of how well a projectile retains velocity in comparison to a standard projectile. Any number less than 1 means it retains less velocity at a given range, 1 is equal, and more than 1 denotes more retained velocity. Another way of looking at it is that it reflects a bullet's drag characteristics. </p><p></p><p>In calculating BC, the bullet's FORM is considered in relation to SD, which presents a NON-DIMENSIONAL value for comparison. BC for a given form is directly proportional to SD. </p><p></p><p>Try "Understanding Firearm Ballistics" by Robert Rinker. It is a cheap and time saving education, which cover interior/exterior and terminal ballistics. Luck.</p></blockquote><p></p>
[QUOTE="MAX, post: 28102, member: 184"] [b]Re: sectional density\'s effect on bullet performance[/b] sscoyote, SD or sectional density is a measure of mass to cross section of a projectile. For a given caliber, higher SD means greater penetration IF ALL OTHER THINGS ARE EQUAL. SD is used to calculate ballistic coefficient(BC). BC is a measure of how well a projectile retains velocity in comparison to a standard projectile. Any number less than 1 means it retains less velocity at a given range, 1 is equal, and more than 1 denotes more retained velocity. Another way of looking at it is that it reflects a bullet's drag characteristics. In calculating BC, the bullet's FORM is considered in relation to SD, which presents a NON-DIMENSIONAL value for comparison. BC for a given form is directly proportional to SD. Try "Understanding Firearm Ballistics" by Robert Rinker. It is a cheap and time saving education, which cover interior/exterior and terminal ballistics. Luck. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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sectional density's effect on bullet performance
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