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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
9 o'clock vs. 3 o'clock wind drifts different with same wind velocity???
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<blockquote data-quote="shortpants" data-source="post: 615331" data-attributes="member: 30564"><p>Jeff, great shooting as always! I'd love to attend a shooting siminar of yours. Do you have this years dates worked out? Also it sounds like the Shooter program is very similar to my Bullet Flight program except my app was $30. Oh well it seems to be an amazing tool. It's got some features that I don't even know what they do. For years I have tried using ballistic programs and have had great success with getting my elevation drops to match up pretty close but my windage corrections have always been off. I have always just measured wind with a wind meter and then shot and wrote down the moa correction for that reading on my drop chart. I always have needed around 1.5moa more correction than any program would tell me I needed at 500 yds. That is the range I typically test wind at. In the past my shooting skills and equipment have limited me to this range ( factory gun/factory ammo ). I'm working on the equipment part right now so the sky is the limit in the near future. What I have finally realized is these ballistic programs are not the problem but instead it's my lack of ability to properly dope the wind. A 3mph wind meter reading while laying prone does not mean I should hold for 3mph. As soon as the bullet leaves the bore it climbs high above my position. The wind speeds up there are obviously faster than what is felt at ground level.</p><p>Example 1: Shooting in WY earlier this year at 530 yds. I shot 3 times at a 12" steel plate missing all 3 shots. I held no wind because I felt no wind and did not give SD or CE any thought at all as most probably wouldn't. I drove up to check the target to find 2 of the shots had gone through the leg of the target about 1 1/2" apart which puts it @12" from the center of the steel plate. After adjusting I shot a 2 1/2" group into the center of the plate. Now going back through this using Bullet Flight I find that nearly 2" of that miss was the effects of SD and CE and the other 10" was a wind up in the bullets flight path of @ 5mph. </p><p></p><p>Example 2: Shooting 500yds here in AZ with a wind reading of 3-5mph from 8 o'clock I dialed for a 4mph wind and fired a few shots very constantly hitting right of the 12" steel plate between the plate and leg of the target. Just the factor of SD and CE alone might have been enough to get me kissing the edge of the steel plate and by changing that 4mph to 6mph I'm right in the middle. After correcting for my mistakes I shot a 3" group into the middle. </p><p></p><p>I realize these 2 examples are quite elementary for a lot of you on this site but they have proven to me the importance of learning to read the wind properly and not doing what you see on tv and also not ignoring the effects of SD and CE. They are real and they are constant which makes them simple to factor in especially if your using a program that does it for you. A high B.C. bullet sure helps as well. I hope this thread others as much as it has helped me!!!</p></blockquote><p></p>
[QUOTE="shortpants, post: 615331, member: 30564"] Jeff, great shooting as always! I'd love to attend a shooting siminar of yours. Do you have this years dates worked out? Also it sounds like the Shooter program is very similar to my Bullet Flight program except my app was $30. Oh well it seems to be an amazing tool. It's got some features that I don't even know what they do. For years I have tried using ballistic programs and have had great success with getting my elevation drops to match up pretty close but my windage corrections have always been off. I have always just measured wind with a wind meter and then shot and wrote down the moa correction for that reading on my drop chart. I always have needed around 1.5moa more correction than any program would tell me I needed at 500 yds. That is the range I typically test wind at. In the past my shooting skills and equipment have limited me to this range ( factory gun/factory ammo ). I'm working on the equipment part right now so the sky is the limit in the near future. What I have finally realized is these ballistic programs are not the problem but instead it's my lack of ability to properly dope the wind. A 3mph wind meter reading while laying prone does not mean I should hold for 3mph. As soon as the bullet leaves the bore it climbs high above my position. The wind speeds up there are obviously faster than what is felt at ground level. Example 1: Shooting in WY earlier this year at 530 yds. I shot 3 times at a 12" steel plate missing all 3 shots. I held no wind because I felt no wind and did not give SD or CE any thought at all as most probably wouldn't. I drove up to check the target to find 2 of the shots had gone through the leg of the target about 1 1/2" apart which puts it @12" from the center of the steel plate. After adjusting I shot a 2 1/2" group into the center of the plate. Now going back through this using Bullet Flight I find that nearly 2" of that miss was the effects of SD and CE and the other 10" was a wind up in the bullets flight path of @ 5mph. Example 2: Shooting 500yds here in AZ with a wind reading of 3-5mph from 8 o'clock I dialed for a 4mph wind and fired a few shots very constantly hitting right of the 12" steel plate between the plate and leg of the target. Just the factor of SD and CE alone might have been enough to get me kissing the edge of the steel plate and by changing that 4mph to 6mph I'm right in the middle. After correcting for my mistakes I shot a 3" group into the middle. I realize these 2 examples are quite elementary for a lot of you on this site but they have proven to me the importance of learning to read the wind properly and not doing what you see on tv and also not ignoring the effects of SD and CE. They are real and they are constant which makes them simple to factor in especially if your using a program that does it for you. A high B.C. bullet sure helps as well. I hope this thread others as much as it has helped me!!! [/QUOTE]
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9 o'clock vs. 3 o'clock wind drifts different with same wind velocity???
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