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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
A small contribution to the shooting community
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<blockquote data-quote="Eaglet" data-source="post: 381745" data-attributes="member: 3756"><p>Mikecr, good question!</p><p> </p><p>I will tell you how I do it.</p><p> </p><p>I know is a value between 0.5 and 1.0 by studying the bullet diagrams on</p><p> </p><p>Bryan Litz's book, I can get pretty close at guessing the number. I have tested</p><p> </p><p>my self and as the book states it, it can easily be done. It also states</p><p> </p><p>how difficult it is to calculate it. You might find some info. on line that would be</p><p> </p><p>useful. What we need to keep in mind is that we don't have a whole lot to </p><p> </p><p>err with, we'll go from 0.5 to 1.0 being 1.0 perfectly tangent ogive radius.</p><p> </p><p>By looking at the bullets diagrams and seeing their Rt/R ratio values and how</p><p> </p><p>they change in value as the bullet ogive changes you get a pretty good idea of</p><p> </p><p>what you're doing.</p><p> </p><p>I know I'm not giving you what you want to hear, but with a bit of practice</p><p> </p><p>one can really get close to calculating them BC7s.</p><p> </p><p>There is a whole lot to learn about that stuff! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="Eaglet, post: 381745, member: 3756"] Mikecr, good question! I will tell you how I do it. I know is a value between 0.5 and 1.0 by studying the bullet diagrams on Bryan Litz's book, I can get pretty close at guessing the number. I have tested my self and as the book states it, it can easily be done. It also states how difficult it is to calculate it. You might find some info. on line that would be useful. What we need to keep in mind is that we don't have a whole lot to err with, we'll go from 0.5 to 1.0 being 1.0 perfectly tangent ogive radius. By looking at the bullets diagrams and seeing their Rt/R ratio values and how they change in value as the bullet ogive changes you get a pretty good idea of what you're doing. I know I'm not giving you what you want to hear, but with a bit of practice one can really get close to calculating them BC7s. There is a whole lot to learn about that stuff! :D [/QUOTE]
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