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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Down draft effects on bullet flight ?
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<blockquote data-quote="SBruce" data-source="post: 435373" data-attributes="member: 21068"><p>I've contemplated the same things recently, but all of my shooting is done in relatively flat country; so I haven't thought alot about it.</p><p> </p><p>The old Sierra program I've got has a spot for vertical winds, and definately changes the impact with an input in that box.</p><p> </p><p>Using the 338 Edge as an example, I punched in 10 mph vertical and a minus 10 mph vertical.......suprisingly, it showed a difference in drop of 25" either way from no wind at all at 850 yds!! This was nearly the amount of a 10 mph true crosswind according to the program.</p><p> </p><p>I would think that vertical winds and up/down drafts happen frequently in steep mountain shooting. I would also think that the shooter would need to figure how much of the total wind is acting vertical vs horizontal and apply both corrections simultaniously.</p><p> </p><p>I can imagine shooting down hill, parallel and along the apex of a ridge, with a wind blowing from the right and behind. It seems perfectly reasonable that the wind would actually "lift" the bullet and try to push it away from the ridgeline, counteracting gravity. Between shooting down hill and the artificial lift, I can imagine shooting way high. Not to mention the crosswind effect because the wind is trying to "turn around" the ridge too!!......Wow, way too much thinking involved!!</p><p> </p><p>Good selling point for the old Sierra program on a PDA. I haven't found anyplace to input any kind of vertical winds in the Nightforce program. I don't know if the newer Sierra stuff has that box or not?</p></blockquote><p></p>
[QUOTE="SBruce, post: 435373, member: 21068"] I've contemplated the same things recently, but all of my shooting is done in relatively flat country; so I haven't thought alot about it. The old Sierra program I've got has a spot for vertical winds, and definately changes the impact with an input in that box. Using the 338 Edge as an example, I punched in 10 mph vertical and a minus 10 mph vertical.......suprisingly, it showed a difference in drop of 25" either way from no wind at all at 850 yds!! This was nearly the amount of a 10 mph true crosswind according to the program. I would think that vertical winds and up/down drafts happen frequently in steep mountain shooting. I would also think that the shooter would need to figure how much of the total wind is acting vertical vs horizontal and apply both corrections simultaniously. I can imagine shooting down hill, parallel and along the apex of a ridge, with a wind blowing from the right and behind. It seems perfectly reasonable that the wind would actually "lift" the bullet and try to push it away from the ridgeline, counteracting gravity. Between shooting down hill and the artificial lift, I can imagine shooting way high. Not to mention the crosswind effect because the wind is trying to "turn around" the ridge too!!......Wow, way too much thinking involved!! Good selling point for the old Sierra program on a PDA. I haven't found anyplace to input any kind of vertical winds in the Nightforce program. I don't know if the newer Sierra stuff has that box or not? [/QUOTE]
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Down draft effects on bullet flight ?
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