Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Hunting
Extreme Long Range Hunting & Shooting (ELR)
why do shots drop more when shooting at a small incline at extreme range?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Shawn Carlock" data-source="post: 682579" data-attributes="member: 4"><p>An interesting note about up/downhill shooting. You will shooting at extreme distance impact higher shooting uphill than you do downhill. I am talking about 15-20 degree shots here. Let's take for example that you are shooting 2000 yards and there is an elevation difference from you to the target of 2000 feet (cosine of .94 or so). You are shooting uphill, the station pressure at your position is 26.5", the station pressure at the target is roughly 24.5". The accurate shoot to pressure over the distance of the shot is 25.5". If you disreguard this averaging of the pressure over the distance of the shot (I do not know of any ballistic programs that do this for you) you will impact high because the air gets thinner from the time the bullet leaves the muzzle until it impacts. Note check the difference 1" of pressure makes with your round at 2000 yards. Of course the opposite of this is true shooting downhill at the same angle and distance you will impact lower due to the air getting thicker over the shot distance. Both uphill and down hill will shoot flatter than a horizonal distance fo 2000 yards but they will not be the same both up and down hill. This business of averaging the pressure over the distance of the shot is not to be taken lightly at loooooong distances. At 2750 yards and 2000' elevation difference failure to average pressure will result in about 8 feet difference in impact (witha 338 Edge +P). This is not just computed data, we shot and filmed this test for Send It volume 4. This also brings up a question about correct validation at long ranges shooting anything but completly flat shots. We have started teaching this pressure averaging in our extreme range classes and it has worked quite well. I hope I explained this clear enough. </p><p> </p><p>This is not exactly answering the original posted question about small inclines but seemed like it had bearing on the thread. Hope this helps.</p></blockquote><p></p>
[QUOTE="Shawn Carlock, post: 682579, member: 4"] An interesting note about up/downhill shooting. You will shooting at extreme distance impact higher shooting uphill than you do downhill. I am talking about 15-20 degree shots here. Let's take for example that you are shooting 2000 yards and there is an elevation difference from you to the target of 2000 feet (cosine of .94 or so). You are shooting uphill, the station pressure at your position is 26.5", the station pressure at the target is roughly 24.5". The accurate shoot to pressure over the distance of the shot is 25.5". If you disreguard this averaging of the pressure over the distance of the shot (I do not know of any ballistic programs that do this for you) you will impact high because the air gets thinner from the time the bullet leaves the muzzle until it impacts. Note check the difference 1" of pressure makes with your round at 2000 yards. Of course the opposite of this is true shooting downhill at the same angle and distance you will impact lower due to the air getting thicker over the shot distance. Both uphill and down hill will shoot flatter than a horizonal distance fo 2000 yards but they will not be the same both up and down hill. This business of averaging the pressure over the distance of the shot is not to be taken lightly at loooooong distances. At 2750 yards and 2000' elevation difference failure to average pressure will result in about 8 feet difference in impact (witha 338 Edge +P). This is not just computed data, we shot and filmed this test for Send It volume 4. This also brings up a question about correct validation at long ranges shooting anything but completly flat shots. We have started teaching this pressure averaging in our extreme range classes and it has worked quite well. I hope I explained this clear enough. This is not exactly answering the original posted question about small inclines but seemed like it had bearing on the thread. Hope this helps. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Extreme Long Range Hunting & Shooting (ELR)
why do shots drop more when shooting at a small incline at extreme range?
Top