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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
uphill/down hill shooting
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<blockquote data-quote="horse2960" data-source="post: 518429" data-attributes="member: 32629"><p>Just thought I would put this out for those of you that hunt steep country like I do. I know it is comon practise to use horizontal distance or cos of angle gages. from reading Aurther J Pejsa book "modern practical Balistics" I know cos or horizontal distance is <strong>wrong</strong> ( hear me out). Bullets are not acted on horizontal distance. They are acted on <strong>time of flight,</strong>only<strong>.</strong> His chapter on uphill/downhill shooting is an important read for anyone that shoots on steep angles.What I didn't know is how wrong is it. There is a lot of wrong information out there by supposably informed people. </p><p>From my research you can use the horizontal distance out to about 400yds with not much more than an inch off. At 500yds and beyoud things get worse. for example I ran a BC of .404 (WSM300 165gr) and at 600yrd @30degress I would be 5.44 inches low, A700yrds @20 degress I would be 5.05" low. this is that it would shoot low if you diled to the rang that the cos of the ange would give you. I think that most long range shooter can see this could result in a miss. I should mention That I am getting this data from Arther Pejsa's balistic softwear.(won't run on Vista could only get is to run on Windows XP). The only one that I tust as I know that he understands that the scope angle has a lot to do with subject. </p><p>To sume things up I am confident now to shoot using the cos ange out to 400yrds at 500and 30degress I need to start to ajust. I still have to shoot and verify this data but mathmaticaly I believe it to be right. wouldn't mind if someone else did some testing as well. I hope this is helpful and I am open to coments.</p><p> Larry In BC Canada</p></blockquote><p></p>
[QUOTE="horse2960, post: 518429, member: 32629"] Just thought I would put this out for those of you that hunt steep country like I do. I know it is comon practise to use horizontal distance or cos of angle gages. from reading Aurther J Pejsa book "modern practical Balistics" I know cos or horizontal distance is [B]wrong[/B] ( hear me out). Bullets are not acted on horizontal distance. They are acted on [B]time of flight,[/B]only[B].[/B] His chapter on uphill/downhill shooting is an important read for anyone that shoots on steep angles.What I didn't know is how wrong is it. There is a lot of wrong information out there by supposably informed people. From my research you can use the horizontal distance out to about 400yds with not much more than an inch off. At 500yds and beyoud things get worse. for example I ran a BC of .404 (WSM300 165gr) and at 600yrd @30degress I would be 5.44 inches low, A700yrds @20 degress I would be 5.05" low. this is that it would shoot low if you diled to the rang that the cos of the ange would give you. I think that most long range shooter can see this could result in a miss. I should mention That I am getting this data from Arther Pejsa's balistic softwear.(won't run on Vista could only get is to run on Windows XP). The only one that I tust as I know that he understands that the scope angle has a lot to do with subject. To sume things up I am confident now to shoot using the cos ange out to 400yrds at 500and 30degress I need to start to ajust. I still have to shoot and verify this data but mathmaticaly I believe it to be right. wouldn't mind if someone else did some testing as well. I hope this is helpful and I am open to coments. Larry In BC Canada [/QUOTE]
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