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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help: Gun vs.Target - steep shots, barometric adjustments with big elevation change?
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<blockquote data-quote="Augustus" data-source="post: 190652" data-attributes="member: 10142"><p>I noticed that my Atrag had no way of dealing with + or _ inclination angles. That really bothered me so I did a little reading. Most of the material was on the Horus Vision Website, according to this material gravity has the same effect on a projectile whether it is shot uphill or downhill. This is how it was explained. To simplify the explanation imagine standing on a hill, you see a nice sis/six bull and your Sworo. says he is 707 yds away. When you aim at him your inclination angle is 45 deg. If you think about it you have now described a right triangle with the hypotenuse being represented by the 707 yds that is your line of sight. The leg oppisite your position is the actual horizontal distance to the bull which is 500 yds. Gravity only acts on the projectile for the actual horozontal distance. It would make no difference if you and the bull changed position the come-up would be the same regardless if the bull was above or below you. The question the gentleman asked about shooting from one elevation to another can become rather complicated due to the interaction of BC,temp, and baro. press. Ther interaction will change when shooting uphill or downhill. Thinking about this makes my head hurt and there is no way the average Joe is going to sort all of this out while looking at the bull. You are either going to have a ballistic program to sort this out or avoid shooting through drastic elevation changes. I played with a few exterme scenerios and if all the forces line up to pull the same way at the same time the error can be significant.</p></blockquote><p></p>
[QUOTE="Augustus, post: 190652, member: 10142"] I noticed that my Atrag had no way of dealing with + or _ inclination angles. That really bothered me so I did a little reading. Most of the material was on the Horus Vision Website, according to this material gravity has the same effect on a projectile whether it is shot uphill or downhill. This is how it was explained. To simplify the explanation imagine standing on a hill, you see a nice sis/six bull and your Sworo. says he is 707 yds away. When you aim at him your inclination angle is 45 deg. If you think about it you have now described a right triangle with the hypotenuse being represented by the 707 yds that is your line of sight. The leg oppisite your position is the actual horizontal distance to the bull which is 500 yds. Gravity only acts on the projectile for the actual horozontal distance. It would make no difference if you and the bull changed position the come-up would be the same regardless if the bull was above or below you. The question the gentleman asked about shooting from one elevation to another can become rather complicated due to the interaction of BC,temp, and baro. press. Ther interaction will change when shooting uphill or downhill. Thinking about this makes my head hurt and there is no way the average Joe is going to sort all of this out while looking at the bull. You are either going to have a ballistic program to sort this out or avoid shooting through drastic elevation changes. I played with a few exterme scenerios and if all the forces line up to pull the same way at the same time the error can be significant. [/QUOTE]
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Help: Gun vs.Target - steep shots, barometric adjustments with big elevation change?
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