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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Effects of wind?
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<blockquote data-quote="jb1000br" data-source="post: 80631" data-attributes="member: 1459"><p>[ QUOTE ]</p><p>JB,</p><p>I noticed it with my 260Rem. I just ran the .7 BC 3000 fps, because I'm waiting for my new 7-270WSM to show up!</p><p>Even with 20mph head and tail wind, the computed difference is only .5MOA.</p><p>Usually you would never get that much difference in one day.</p><p>Where I shoot it is also more complicted because it is open behind us, a dip in the range between 200-400 yards, and there is a hill to the left of us.</p><p>We get all kinds of up/down drafts as well. </p><p>Nevertheless any decent long range cartridge shoots very flat from a geometry point of view.</p><p>I still say that the calcs are correct that a strong head wind will lower the POI.</p><p>The target rifle guys who told me this all shoot .308 with 155 grain bullets.</p><p>Anytime we are seeing enough to be important, there are probably up/down drafts involved as well. </p><p></p><p>[/ QUOTE ]</p><p></p><p>You definately have some updrafts there then /ubbthreads/images/graemlins/shocked.gif</p><p></p><p>the 260 and 308 info above came from a FLAT range, and the 6br was fired at williamsport 1KBR</p><p></p><p>the br rose almost 12" with a 15-20MPH head gust.</p><p></p><p>the 308 (168SMK) and 260(139scenar) rose 1.5-2.0moa with a seemingly constant 20MPH headwind.</p><p></p><p>I'll stick to my thinking, where you cant make up a hard and fast rule for every round and every range /ubbthreads/images/graemlins/smile.gif</p><p></p><p>Do update me if you see anything different, and i'll do the same /ubbthreads/images/graemlins/wink.gif</p><p></p><p>Cheers,</p><p>JB</p></blockquote><p></p>
[QUOTE="jb1000br, post: 80631, member: 1459"] [ QUOTE ] JB, I noticed it with my 260Rem. I just ran the .7 BC 3000 fps, because I'm waiting for my new 7-270WSM to show up! Even with 20mph head and tail wind, the computed difference is only .5MOA. Usually you would never get that much difference in one day. Where I shoot it is also more complicted because it is open behind us, a dip in the range between 200-400 yards, and there is a hill to the left of us. We get all kinds of up/down drafts as well. Nevertheless any decent long range cartridge shoots very flat from a geometry point of view. I still say that the calcs are correct that a strong head wind will lower the POI. The target rifle guys who told me this all shoot .308 with 155 grain bullets. Anytime we are seeing enough to be important, there are probably up/down drafts involved as well. [/ QUOTE ] You definately have some updrafts there then [img]/ubbthreads/images/graemlins/shocked.gif[/img] the 260 and 308 info above came from a FLAT range, and the 6br was fired at williamsport 1KBR the br rose almost 12" with a 15-20MPH head gust. the 308 (168SMK) and 260(139scenar) rose 1.5-2.0moa with a seemingly constant 20MPH headwind. I'll stick to my thinking, where you cant make up a hard and fast rule for every round and every range [img]/ubbthreads/images/graemlins/smile.gif[/img] Do update me if you see anything different, and i'll do the same [img]/ubbthreads/images/graemlins/wink.gif[/img] Cheers, JB [/QUOTE]
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