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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
dope help
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<blockquote data-quote="FearNoWind" data-source="post: 1090538" data-attributes="member: 50867"><p>I have never found any reason to question the BC data published by Berger for its VLDs. For some other bullet manufacturers, yes. Berger, no. I believe you will find your 6.5 140 grain VLDs listed as .612 BC. IMO, you'll do well to stick with that figure until you've got a very good chronograph and data with consistently low SD/ES with which to do a carefully managed analysis on your own. </p><p>If your MV assumption of 2930 is flawed you're wasting ammunition chasing long range ghosts. Even at a MV of 2930 fps, by the time that little pill reaches out to 1200 yards it is just barely supersonic so it wouldn't take much to adversely affect its trajectory.</p></blockquote><p></p>
[QUOTE="FearNoWind, post: 1090538, member: 50867"] I have never found any reason to question the BC data published by Berger for its VLDs. For some other bullet manufacturers, yes. Berger, no. I believe you will find your 6.5 140 grain VLDs listed as .612 BC. IMO, you'll do well to stick with that figure until you've got a very good chronograph and data with consistently low SD/ES with which to do a carefully managed analysis on your own. If your MV assumption of 2930 is flawed you're wasting ammunition chasing long range ghosts. Even at a MV of 2930 fps, by the time that little pill reaches out to 1200 yards it is just barely supersonic so it wouldn't take much to adversely affect its trajectory. [/QUOTE]
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