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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
enviromental effects on trajectory
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<blockquote data-quote="youarenotcrazy" data-source="post: 22555" data-attributes="member: 555"><p>Ok, from what I understand, there is a formula in the Sierra reloading manual that take environmental effects and modifies your ballistic coefficient so you can simply plug that in to your ballistics program and get your new trajectory. This formaula takes temperature, barometric pressure, and altitude into effect. It does not do humidity. I am in process of writing a ballistics program on my graphing calculator and am trying to get almost every effect taken care of. </p><p> Now if humid air is more dense than dry air, your bullet would drop less, correct? There would be less air resistance so there would be a lower drag, right? I went to snipersparadise.com and they said there would be less upward force ( <img src="http://images/icons/confused.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> )? So who would be correct, less wind resistance or less "upward force" (whatever the hell that means). </p><p> One more thing, please bare with me, what would you all say, on average, the difference in muzzle velocity is with varying temperature with your particular powder (if you could list that powder that would be great)(like 1.5fps/degree F)? I was just trying to map out burn rate trends with different powders so I would have a better idea of how fast I would be starting out under varying conditions.</p><p> Hope I didn't lose anybody, sorry for such a long d$%^ post. Thanks everyone!</p></blockquote><p></p>
[QUOTE="youarenotcrazy, post: 22555, member: 555"] Ok, from what I understand, there is a formula in the Sierra reloading manual that take environmental effects and modifies your ballistic coefficient so you can simply plug that in to your ballistics program and get your new trajectory. This formaula takes temperature, barometric pressure, and altitude into effect. It does not do humidity. I am in process of writing a ballistics program on my graphing calculator and am trying to get almost every effect taken care of. Now if humid air is more dense than dry air, your bullet would drop less, correct? There would be less air resistance so there would be a lower drag, right? I went to snipersparadise.com and they said there would be less upward force ( [img]images/icons/confused.gif[/img] )? So who would be correct, less wind resistance or less "upward force" (whatever the hell that means). One more thing, please bare with me, what would you all say, on average, the difference in muzzle velocity is with varying temperature with your particular powder (if you could list that powder that would be great)(like 1.5fps/degree F)? I was just trying to map out burn rate trends with different powders so I would have a better idea of how fast I would be starting out under varying conditions. Hope I didn't lose anybody, sorry for such a long d$%^ post. Thanks everyone! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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enviromental effects on trajectory
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