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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Tipping Bullets & Custom Drag Curve Modeling
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<blockquote data-quote="Mikecr" data-source="post: 1246311" data-attributes="member: 1521"><p>When it comes to 1st shot accuracy (not just getting on paper), I don't think a single muzzle velocity adjustment will work so well across a gamut of ranges -for a drag curve discrepancy.</p><p></p><p>The issue we've had with G1 BCs is that the curve wasn't a match for higher BC bullets in use. Basically,, your situation.</p><p>With this, our solutions would be right at this or that range, but not both. We could adjust MV to make a particular range solution right, but this departs from an adjustment made at another range, undoing it.. So to make G1 solutions right across many ranges took varying MV adjustments at many ranges. We're talking manual operations, a lot of time & testing, to create a better field click card.</p><p></p><p>Going to a better match curve for many bullets (G7), reduced the amplitude of discrepancies across supersonic ranges (at least). For many, this in itself made everything good enough.</p><p>This is an entire curve change, with different math conveniently selected in software that allows it. YOUR modified bullet drag will not fit G7, or G5, or matching that of any standard (amplitude wise). I don't know if your AB software allows construction of a custom curve.</p><p></p><p>You could shift application of a standard curve with an air density bias.</p><p>With a Kestrel For instance you could shift pressure from 29.92 @ SL to 28.85 (a miscalibration).</p><p>With that your solutions are still following a curve at the correct velocity points(range), while biased for less effective drag at each point.</p><p></p><p>It's something to consider. You will never know how your modified bullet actually changes the shape of it's drag curve. But if it doesn't change the shape(just amplitude), and a selected curve suits, you could lock in adjusted solutions to that selected curve. </p><p>This might work right across your various ranges of shooting.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1246311, member: 1521"] When it comes to 1st shot accuracy (not just getting on paper), I don't think a single muzzle velocity adjustment will work so well across a gamut of ranges -for a drag curve discrepancy. The issue we've had with G1 BCs is that the curve wasn't a match for higher BC bullets in use. Basically,, your situation. With this, our solutions would be right at this or that range, but not both. We could adjust MV to make a particular range solution right, but this departs from an adjustment made at another range, undoing it.. So to make G1 solutions right across many ranges took varying MV adjustments at many ranges. We're talking manual operations, a lot of time & testing, to create a better field click card. Going to a better match curve for many bullets (G7), reduced the amplitude of discrepancies across supersonic ranges (at least). For many, this in itself made everything good enough. This is an entire curve change, with different math conveniently selected in software that allows it. YOUR modified bullet drag will not fit G7, or G5, or matching that of any standard (amplitude wise). I don't know if your AB software allows construction of a custom curve. You could shift application of a standard curve with an air density bias. With a Kestrel For instance you could shift pressure from 29.92 @ SL to 28.85 (a miscalibration). With that your solutions are still following a curve at the correct velocity points(range), while biased for less effective drag at each point. It's something to consider. You will never know how your modified bullet actually changes the shape of it's drag curve. But if it doesn't change the shape(just amplitude), and a selected curve suits, you could lock in adjusted solutions to that selected curve. This might work right across your various ranges of shooting. [/QUOTE]
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