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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic Calculators - Bullet Drops when Shooting at Inclination Angles...
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<blockquote data-quote="speedengineer" data-source="post: 1822277" data-attributes="member: 112986"><p>Short version - Who likes solving puzzles? Why do Hornady's ballistic calculator results differ from other calculators when shooting at inclination angles? Is this accurate, or not? I live in flatland...I have no way to test empirically. </p><p></p><p>Hi all. I recently wrote my own point-mass ballistics calculator, and have been comparing its output to several other free ballistic calculators to help validate its accuracy. During these comparisons, I noticed some interesting observations, especially pertaining shooting at inclination angles (either upwards or downwards).</p><ul> <li data-xf-list-type="ul">When firing horizontally, every ballistic calculator I tried provided effectively the same answer.</li> <li data-xf-list-type="ul">When firing upwards or downwards, my calculator and all others agree, except Hornady's suggests substantially less vertical correction is required - around 25% less correction for a 30 degree shooting angle. That's an aim point difference of over 20cm at 500 meters.</li> <li data-xf-list-type="ul">Both Hornady standard 3DOF and their 4DOF provide these results. </li> <li data-xf-list-type="ul">The difference in calculation results increases with increased inclination angle</li> <li data-xf-list-type="ul">I have listed the Hornady results excluding the aerodynamic jump and spin drift components, to be consistent with the other calculators. (Aero jump would make the Hornady correction value smaller, anyway...)</li> </ul><p></p><p>Questions...</p><ul> <li data-xf-list-type="ul">Does anyone have any personal experience validating their rifle's bullet drop at high inclination angles? </li> <li data-xf-list-type="ul">I am 99% sure I have made no errors entering info into the various calculators. The fact that the wind drift and velocity profile numbers come out spot on suggests no input error. Do you see substantial differences in your calculations between different calculators?</li> </ul><p>Note - I am not trying to bash Hornady here, I use their products and like their ballistics calculator app, just confused as to the results inconsistency. I'm hoping they know something I don't and their solution is providing the more accurate result. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Thanks for any feedback or discussion. I am genuinely interested in understanding what's going on here.</p></blockquote><p></p>
[QUOTE="speedengineer, post: 1822277, member: 112986"] Short version - Who likes solving puzzles? Why do Hornady's ballistic calculator results differ from other calculators when shooting at inclination angles? Is this accurate, or not? I live in flatland...I have no way to test empirically. Hi all. I recently wrote my own point-mass ballistics calculator, and have been comparing its output to several other free ballistic calculators to help validate its accuracy. During these comparisons, I noticed some interesting observations, especially pertaining shooting at inclination angles (either upwards or downwards). [LIST] [*]When firing horizontally, every ballistic calculator I tried provided effectively the same answer. [*]When firing upwards or downwards, my calculator and all others agree, except Hornady's suggests substantially less vertical correction is required - around 25% less correction for a 30 degree shooting angle. That's an aim point difference of over 20cm at 500 meters. [*]Both Hornady standard 3DOF and their 4DOF provide these results. [*]The difference in calculation results increases with increased inclination angle [*]I have listed the Hornady results excluding the aerodynamic jump and spin drift components, to be consistent with the other calculators. (Aero jump would make the Hornady correction value smaller, anyway...) [/LIST] Questions... [LIST] [*]Does anyone have any personal experience validating their rifle's bullet drop at high inclination angles? [*]I am 99% sure I have made no errors entering info into the various calculators. The fact that the wind drift and velocity profile numbers come out spot on suggests no input error. Do you see substantial differences in your calculations between different calculators? [/LIST] Note - I am not trying to bash Hornady here, I use their products and like their ballistics calculator app, just confused as to the results inconsistency. I'm hoping they know something I don't and their solution is providing the more accurate result. :) Thanks for any feedback or discussion. I am genuinely interested in understanding what's going on here. [/QUOTE]
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