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High Velocity Of High BC
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<blockquote data-quote="Bullet bumper" data-source="post: 508561" data-attributes="member: 17844"><p>It is just a pity that German Salazar does not have a clue on this subject . The BC of any bullet varies as it's velocity varies , because drag varies with velocity.A BC is a measure of a bullets abillity to resist drag so as velocity varies drag so the BC changes at certain places in the trajectory.The single BC that is quoted by bullet manufacturers is an averaging of many BC's taken at velocity points in the trajectory . To model a trajectory better you need multiple BC's and their respective velocity boundries. As velocity erodes the BC usually goes up as the drag is reduced but as it hits the transonic zone it falls again . This does not mean a bullet wil not shoot well at some lower velocity as the BC will usually be higher but the trajectory will be higher and the low velocity will reduce range where the transonic zone comes in . So it's a balance of a good average BC and a velocity that gives a flat trajectory while pushing the transonic zone out as far as possible for that load. While still having a safe pressure load.</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 508561, member: 17844"] It is just a pity that German Salazar does not have a clue on this subject . The BC of any bullet varies as it's velocity varies , because drag varies with velocity.A BC is a measure of a bullets abillity to resist drag so as velocity varies drag so the BC changes at certain places in the trajectory.The single BC that is quoted by bullet manufacturers is an averaging of many BC's taken at velocity points in the trajectory . To model a trajectory better you need multiple BC's and their respective velocity boundries. As velocity erodes the BC usually goes up as the drag is reduced but as it hits the transonic zone it falls again . This does not mean a bullet wil not shoot well at some lower velocity as the BC will usually be higher but the trajectory will be higher and the low velocity will reduce range where the transonic zone comes in . So it's a balance of a good average BC and a velocity that gives a flat trajectory while pushing the transonic zone out as far as possible for that load. While still having a safe pressure load. [/QUOTE]
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