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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Questions about my drop chart
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<blockquote data-quote="Greyfox" data-source="post: 1848913" data-attributes="member: 10291"><p>Given your shooting form, tall test(scope), environmental inputs, cosine(slope) adjustments, etc are understood/corrected,, I would first, confirm your initial results with another test. If your results are similar to your first test, I would do a velocity calibration. The Shooting Chrony's I have used were consistently off by as much as 70FPS, usually low Compared to my Magnetopeed and Lab Radar. The easiest way to make the adjustment would be to increase/decrease the velocity in 20FPS increments in your ballistic calculator until the outputs match your actual drops at the various ranges. Correcting for velocity, and/or BC is a fairly common exercise, even when chronographed velocities are accurate. The particular rifle/barrel can induce differences. Since your drops are falling off at 500 yards, I'd adjust velocity. When drops start changing further out (+700 yards), tuning BC may be necessary. IMO.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1848913, member: 10291"] Given your shooting form, tall test(scope), environmental inputs, cosine(slope) adjustments, etc are understood/corrected,, I would first, confirm your initial results with another test. If your results are similar to your first test, I would do a velocity calibration. The Shooting Chrony’s I have used were consistently off by as much as 70FPS, usually low Compared to my Magnetopeed and Lab Radar. The easiest way to make the adjustment would be to increase/decrease the velocity in 20FPS increments in your ballistic calculator until the outputs match your actual drops at the various ranges. Correcting for velocity, and/or BC is a fairly common exercise, even when chronographed velocities are accurate. The particular rifle/barrel can induce differences. Since your drops are falling off at 500 yards, I’d adjust velocity. When drops start changing further out (+700 yards), tuning BC may be necessary. IMO. [/QUOTE]
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Questions about my drop chart
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