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Long Range Hunting & Shooting
Long Range Hunting-Video (Shawn Carlock, Defensive Edge)
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<blockquote data-quote="30-338" data-source="post: 196111" data-attributes="member: 10349"><p><strong>What am I missing here???</strong></p><p></p><p>Shawn...I have been puzzling over this cos. X dope issue as an alternate to cos. x distance and I am stumped. I have to be missing something here! Here is my problem...You state that there are 3 alternatives to figure the correct distance for angle shooting. We know the flat line ( base of the right triangle ) formula. And no doubt the Exbal software is most exact, but I cannot make this 3rd alternative work. I watched the video several more times to see if I was misunderstanding what you meant by applying the cosine to the "dope". And I think you are saying that you multiply the cosine with the uncorrected MOA figure off your chart at lasered distance to get the corrected MOA. In the video you use a 45 degree angle and a cosine of .71 and a distanceof 600 yards and you say that even at this range you get a discrepancy of nearly 2 MOA...I tried doing some calcs here using Sierra software. I used an angle of 60 degrees at a distance of 1000 yards and a 300 SMK @ 2800 FPS. I chose the cosine based on the 60 degrees for the sake of simplicity ...a cosine of .5...So here is what I get</p><p>1)(Cosine x distance) .5 x 1000yds = 500 yds. or a drop of 8.8 MOA(100 yd zero) versus</p><p>2)(Cosine x dope) .5 x 25.2 MOA (the drop @ 1000yds in MOA) =12.6 MOA</p><p> </p><p>That is quite a difference i.e. 3.8 MOA @ 1000yards or 39.78 inches</p><p>And it just gets worse the farther out you go...Here is what I think is happening...If we multiply the cos. x dope vs. the cos. x yards we are multiplying along 2 different scales...the yardage is arithmetic and the dope is hyperbolic ( or not a true parabola....I "think" this is the correct term...not sure though...) because it reflects the increasing curve of the bullet flight as it slows...So the farther out you go, the greater will be the discrepancy between the two methods....What am I doing wrong here? I am not the best math person so I am open to correction as I often make mistakes...but I need your input as to whether I am interpretting your "cos.x dope" formula correctly or whether I have miscalculated something...It appears though , that the cos. x dope method is of limited use and at fairly close ranges.............Thanks for your video. I am getting a lot out of it.....please advise as to the cos. x dope issue...Respectfully 30-338</p></blockquote><p></p>
[QUOTE="30-338, post: 196111, member: 10349"] [b]What am I missing here???[/b] Shawn...I have been puzzling over this cos. X dope issue as an alternate to cos. x distance and I am stumped. I have to be missing something here! Here is my problem...You state that there are 3 alternatives to figure the correct distance for angle shooting. We know the flat line ( base of the right triangle ) formula. And no doubt the Exbal software is most exact, but I cannot make this 3rd alternative work. I watched the video several more times to see if I was misunderstanding what you meant by applying the cosine to the "dope". And I think you are saying that you multiply the cosine with the uncorrected MOA figure off your chart at lasered distance to get the corrected MOA. In the video you use a 45 degree angle and a cosine of .71 and a distanceof 600 yards and you say that even at this range you get a discrepancy of nearly 2 MOA...I tried doing some calcs here using Sierra software. I used an angle of 60 degrees at a distance of 1000 yards and a 300 SMK @ 2800 FPS. I chose the cosine based on the 60 degrees for the sake of simplicity ...a cosine of .5...So here is what I get 1)(Cosine x distance) .5 x 1000yds = 500 yds. or a drop of 8.8 MOA(100 yd zero) versus 2)(Cosine x dope) .5 x 25.2 MOA (the drop @ 1000yds in MOA) =12.6 MOA That is quite a difference i.e. 3.8 MOA @ 1000yards or 39.78 inches And it just gets worse the farther out you go...Here is what I think is happening...If we multiply the cos. x dope vs. the cos. x yards we are multiplying along 2 different scales...the yardage is arithmetic and the dope is hyperbolic ( or not a true parabola....I "think" this is the correct term...not sure though...) because it reflects the increasing curve of the bullet flight as it slows...So the farther out you go, the greater will be the discrepancy between the two methods....What am I doing wrong here? I am not the best math person so I am open to correction as I often make mistakes...but I need your input as to whether I am interpretting your "cos.x dope" formula correctly or whether I have miscalculated something...It appears though , that the cos. x dope method is of limited use and at fairly close ranges.............Thanks for your video. I am getting a lot out of it.....please advise as to the cos. x dope issue...Respectfully 30-338 [/QUOTE]
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