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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need help understanding why my ballistics calculator is doing this!!
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<blockquote data-quote="damoncali" data-source="post: 568379" data-attributes="member: 33016"><p>You are correct. If you use a G7 drag function you must use a G7 BC. I'm not terribly familiar with that software, but if the results improved (as one might expect when going from G1 to G7), I would guess it might be a software bug that is simply displaying the wrong drag function's BC, while using the correct one. </p><p></p><p>Now if you're really using the G1 BC with a G7 drag function and getting accurate results, something is quite wrong and you are just getting it right by coincidence.</p><p></p><p>Another comment: There is only one proper drag function for a bullet. It's either G7 or G1 and this doesn't change. For almost all long range bullets, the best choice is G7. This is why I love Bryan Litz's book - it tells you which one to choose. This is the method I used for my own software - you pull a bullet from the library and the software chooses a BC and drag function for you. It's simpler that way.</p><p></p><p>Try rerunning it on my software (it's free): <a href="http://bisonballistics.com/point_mass_calculations/new" target="_blank">Bison Ballistics Calculator</a></p><p></p><p>If you get similar numbers, I can tell you for sure what BC and drag function were used. (I'm fairly certain it's a G7 for that bullet, but I don't publish the BC's on the site out of respect of Bryan's work.)</p><p></p><p>Finally, 1000+ yards is a long way. There are limits to this technology. The further out you go, the more you have to nail the inputs to get a good result.</p></blockquote><p></p>
[QUOTE="damoncali, post: 568379, member: 33016"] You are correct. If you use a G7 drag function you must use a G7 BC. I'm not terribly familiar with that software, but if the results improved (as one might expect when going from G1 to G7), I would guess it might be a software bug that is simply displaying the wrong drag function's BC, while using the correct one. Now if you're really using the G1 BC with a G7 drag function and getting accurate results, something is quite wrong and you are just getting it right by coincidence. Another comment: There is only one proper drag function for a bullet. It's either G7 or G1 and this doesn't change. For almost all long range bullets, the best choice is G7. This is why I love Bryan Litz's book - it tells you which one to choose. This is the method I used for my own software - you pull a bullet from the library and the software chooses a BC and drag function for you. It's simpler that way. Try rerunning it on my software (it's free): [URL="http://bisonballistics.com/point_mass_calculations/new"]Bison Ballistics Calculator[/URL] If you get similar numbers, I can tell you for sure what BC and drag function were used. (I'm fairly certain it's a G7 for that bullet, but I don't publish the BC's on the site out of respect of Bryan's work.) Finally, 1000+ yards is a long way. There are limits to this technology. The further out you go, the more you have to nail the inputs to get a good result. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need help understanding why my ballistics calculator is doing this!!
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