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<blockquote data-quote="fitzm2" data-source="post: 1495643" data-attributes="member: 19013"><p>Let's see if I can give you some food for thought on these misses. You mentioned that your ballistic compensator adjusted the yardage to 450 yards, but the actual line of sight is probably 500 yds and some change. You mentioned that you had a 1 degree slope and that you were shooting down hill. You also mentioned that there was a 10 mile per hour headwind. </p><p>We know that 1 degree is equal to 92 feet at one mile. If your target is somewhere near 500 yds then we know that your target was somewhere around 30 feet below your line of sight. 500 yds/1760 yds=about 1/3. 1/3 of 92 feet = 30 feet. If we were to draw a triangle with the apex being where you were shooting from , you can see quickly that the wind is not a head wind per se...it is acting as an updraft because of the slope of the hill. </p><p>We can input a 10 mile an hour wind into our ballistic calculator and for a full value wind our drift factor will be somewhere in the neighborhood of 3 minutes based on your 210 grain bullet. Now in a prone position, shooting down hill, that bullet will be traveling basically in ground affect...which means that the air is denser than you would expect. Now, if we take the bullet and view it as an airplane wing, traveling into a 10 mile an hour wind and that wind is affecting the bullet in a constant lift due to the slope of the land, I suspect that we have just exceeded 4 minutes of angle. 4 minutes of angle at 500 yards, that the bullet is actually traveling, puts the bullet about 20 inches above your point of aim. </p><p>From your description of where your bullets were impacting, dose this make sense?</p></blockquote><p></p>
[QUOTE="fitzm2, post: 1495643, member: 19013"] Let's see if I can give you some food for thought on these misses. You mentioned that your ballistic compensator adjusted the yardage to 450 yards, but the actual line of sight is probably 500 yds and some change. You mentioned that you had a 1 degree slope and that you were shooting down hill. You also mentioned that there was a 10 mile per hour headwind. We know that 1 degree is equal to 92 feet at one mile. If your target is somewhere near 500 yds then we know that your target was somewhere around 30 feet below your line of sight. 500 yds/1760 yds=about 1/3. 1/3 of 92 feet = 30 feet. If we were to draw a triangle with the apex being where you were shooting from , you can see quickly that the wind is not a head wind per se...it is acting as an updraft because of the slope of the hill. We can input a 10 mile an hour wind into our ballistic calculator and for a full value wind our drift factor will be somewhere in the neighborhood of 3 minutes based on your 210 grain bullet. Now in a prone position, shooting down hill, that bullet will be traveling basically in ground affect...which means that the air is denser than you would expect. Now, if we take the bullet and view it as an airplane wing, traveling into a 10 mile an hour wind and that wind is affecting the bullet in a constant lift due to the slope of the land, I suspect that we have just exceeded 4 minutes of angle. 4 minutes of angle at 500 yards, that the bullet is actually traveling, puts the bullet about 20 inches above your point of aim. From your description of where your bullets were impacting, dose this make sense? [/QUOTE]
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