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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Drag Function question.
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<blockquote data-quote="TiroFijo" data-source="post: 32236" data-attributes="member: 974"><p>Brent, I really don't know about the algorythims. The G1 funtion is the one the Infinity uses, BUT the program can use the different BCs at different velocities, most programs cannot. There is somewhere in the web a version of the JBM ballistics program altered to use different BC at different velocities, and not surprisingly the results are very similar.</p><p></p><p>Jeff, Sierra tests their bullets in a 300 yds indoor range, and they mimic the velocity decay by downloading. As you probably know this is not the best way to find out real BCs because the spin rate, yaw angle, precession cycles, etc. are not the same, but I understand the differences are minor. A few bullets like the 175 and 190 SMK were tested in military proving grounds, real life extended range tests with doppler radars, yadda, yadda, and this data is of course known to Sierra and matches very well their Infinity program. I've confirmed it myself up to 1000 yds with good results, if your program is giving 31" error then there is something wrong <img src="http://images/icons/confused.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p>I'll post the link to the modified JMB program when I find it, so your can use it to compare with your own data.</p></blockquote><p></p>
[QUOTE="TiroFijo, post: 32236, member: 974"] Brent, I really don't know about the algorythims. The G1 funtion is the one the Infinity uses, BUT the program can use the different BCs at different velocities, most programs cannot. There is somewhere in the web a version of the JBM ballistics program altered to use different BC at different velocities, and not surprisingly the results are very similar. Jeff, Sierra tests their bullets in a 300 yds indoor range, and they mimic the velocity decay by downloading. As you probably know this is not the best way to find out real BCs because the spin rate, yaw angle, precession cycles, etc. are not the same, but I understand the differences are minor. A few bullets like the 175 and 190 SMK were tested in military proving grounds, real life extended range tests with doppler radars, yadda, yadda, and this data is of course known to Sierra and matches very well their Infinity program. I've confirmed it myself up to 1000 yds with good results, if your program is giving 31" error then there is something wrong [img]images/icons/confused.gif[/img] I'll post the link to the modified JMB program when I find it, so your can use it to compare with your own data. [/QUOTE]
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