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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic Program Inconsistencies
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<blockquote data-quote="BryanLitz" data-source="post: 311946" data-attributes="member: 7848"><p>Kyle,</p><p>Yea, GNU is good.</p><p>BalCal is only off by ~17", this could be an atmosphere definition incompatibility.</p><p>However, Ballistix and Lee are way out in left field. I suspect one of two problems:</p><p></p><p>1) Either they're interpreting the G7 BC as a G1. Do the programs let you tell them you're giving it G7? If not, it will not know better and treat it as a G1, hence the extreme drop.</p><p></p><p>2) The Pejsa method requires 'splicing' different solution methods between speed regimes. There are different equations required for supersonic, transonic, and subsonic speed. IF the solution doesn't properly splice the solution (let's assume it's using the supersonic solution thru-ought) it will be way off at long range because it's using the wrong equations. This is why the one program responsibly cuts off at 500 yards; to avoid invalid calculations at low speed.</p><p></p><p>I suspect it's the first of the above two guesses. The velocity isn't low enough to really be into the transonic set of equations.</p><p></p><p>Thanks for the details,</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 311946, member: 7848"] Kyle, Yea, GNU is good. BalCal is only off by ~17", this could be an atmosphere definition incompatibility. However, Ballistix and Lee are way out in left field. I suspect one of two problems: 1) Either they're interpreting the G7 BC as a G1. Do the programs let you tell them you're giving it G7? If not, it will not know better and treat it as a G1, hence the extreme drop. 2) The Pejsa method requires 'splicing' different solution methods between speed regimes. There are different equations required for supersonic, transonic, and subsonic speed. IF the solution doesn't properly splice the solution (let's assume it's using the supersonic solution thru-ought) it will be way off at long range because it's using the wrong equations. This is why the one program responsibly cuts off at 500 yards; to avoid invalid calculations at low speed. I suspect it's the first of the above two guesses. The velocity isn't low enough to really be into the transonic set of equations. Thanks for the details, -Bryan [/QUOTE]
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Ballistic Program Inconsistencies
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