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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Effects of wind?
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<blockquote data-quote="Richard338" data-source="post: 80619" data-attributes="member: 1537"><p>JB, why do you say it spends more time climbing?</p><p>I ran a trajectory calc on JBM's page using 3000fps and a BC of .7.</p><p>The apogee of a 1000 yard zeroed trajectory is at 540 yards, but that occurs at less than half the time for the 1000 yards trajectory because the bullet is going faster at first.</p><p>I added 20 mph head/tail winds and got predicted lower POI for headwind and raised POI for tailwind.</p><p>I had a clear example of a switching head/tail wind at 1000 yards a couple of weeks ago and definately found this to be the case.</p><p>Target rifle shooters have a memory trick "heads-up, and tails down" (as in aim up in a head wind, and aim lower for a tail wind).</p><p>The effect is small in any case but can get you.</p></blockquote><p></p>
[QUOTE="Richard338, post: 80619, member: 1537"] JB, why do you say it spends more time climbing? I ran a trajectory calc on JBM's page using 3000fps and a BC of .7. The apogee of a 1000 yard zeroed trajectory is at 540 yards, but that occurs at less than half the time for the 1000 yards trajectory because the bullet is going faster at first. I added 20 mph head/tail winds and got predicted lower POI for headwind and raised POI for tailwind. I had a clear example of a switching head/tail wind at 1000 yards a couple of weeks ago and definately found this to be the case. Target rifle shooters have a memory trick "heads-up, and tails down" (as in aim up in a head wind, and aim lower for a tail wind). The effect is small in any case but can get you. [/QUOTE]
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