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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How important is bc?
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<blockquote data-quote="Fitch" data-source="post: 357198" data-attributes="member: 19372"><p>Not enough information - you need to specify the cross wind speed. For expediency I'll assume 10 mph at 90 degrees. </p><p> </p><p>delta Wd = 12 * Ws * delta Tlag</p><p> </p><p>delta Wd = difference in wind drift in inches</p><p>Ws = cross wind speed component in ft/sec</p><p>delta Tlag = time of flight difference</p><p> </p><p>Given: </p><p> </p><p>delta Tlag = 0.2 seconds</p><p>Ws = 14.667 ft/sec or 10 mph</p><p> </p><p>Calculate drift:</p><p> </p><p>delta Wd = 12 in/ft * 14.667 ft/sec * 0.2 sec = 35.2 in</p><p> </p><p>You <strong>"really"</strong> need to get a copy of Brian's book and read it from cover to cover. Trust me on this, it <strong>isn't </strong>rocket science. The book makes it very clear.</p><p> </p><p>Fitch</p></blockquote><p></p>
[QUOTE="Fitch, post: 357198, member: 19372"] Not enough information - you need to specify the cross wind speed. For expediency I'll assume 10 mph at 90 degrees. delta Wd = 12 * Ws * delta Tlag delta Wd = difference in wind drift in inches Ws = cross wind speed component in ft/sec delta Tlag = time of flight difference Given: delta Tlag = 0.2 seconds Ws = 14.667 ft/sec or 10 mph Calculate drift: delta Wd = 12 in/ft * 14.667 ft/sec * 0.2 sec = 35.2 in You [B]"really"[/B] need to get a copy of Brian's book and read it from cover to cover. Trust me on this, it [B]isn't [/B]rocket science. The book makes it very clear. Fitch [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
How important is bc?
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