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Hunting
Long Range Hunting & Shooting
**HELP** Need to understand trajectory(heavy VS light) in bullets.
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<blockquote data-quote="Buffalobob" data-source="post: 448315" data-attributes="member: 8"><p>OK, you asked a certain question and what follows is the correct answer. </p><p></p><p>The ballistic coefficient is the number which determines the trajectory and it is is composed of two terms. First term is a shape or form factor and the second term is sectional density or weight.</p><p></p><p>I would invite you attention to a most useful reference</p><p></p><p><a href="http://www.exteriorballistics.com/ebexplained/4th/41.cfm" target="_blank">exterior ballistics</a></p><p></p><p>The Sierra Exterior Ballistic document is very worthwhile reading. And after a few years of shooting long range you should read it again as some of the small details will be fresh and new and you will learn a lot more once again. The guys who wrote it did a good job.</p><p></p><p></p><p></p><p>I would just add two notes----</p><p>1. High sectional density is not only good for the BC but is good for penetrating animals.</p><p>2. A copper bullet with the same shape factor as a gilded lead bullet will have a low SD and low BC. Conversely a heavy bullet with a round nose will have a high SD but poor shape factor and therefore a low BC. There is a time and place for each type of bullet. The buffalo I killed was with a round nosed bullet at 50 yards from the same rifle I used to shoot high BC bullets 1000 yards.</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 448315, member: 8"] OK, you asked a certain question and what follows is the correct answer. The ballistic coefficient is the number which determines the trajectory and it is is composed of two terms. First term is a shape or form factor and the second term is sectional density or weight. I would invite you attention to a most useful reference [url=http://www.exteriorballistics.com/ebexplained/4th/41.cfm]exterior ballistics[/url] The Sierra Exterior Ballistic document is very worthwhile reading. And after a few years of shooting long range you should read it again as some of the small details will be fresh and new and you will learn a lot more once again. The guys who wrote it did a good job. I would just add two notes---- 1. High sectional density is not only good for the BC but is good for penetrating animals. 2. A copper bullet with the same shape factor as a gilded lead bullet will have a low SD and low BC. Conversely a heavy bullet with a round nose will have a high SD but poor shape factor and therefore a low BC. There is a time and place for each type of bullet. The buffalo I killed was with a round nosed bullet at 50 yards from the same rifle I used to shoot high BC bullets 1000 yards. [/QUOTE]
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**HELP** Need to understand trajectory(heavy VS light) in bullets.
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