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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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<blockquote data-quote="Glock119" data-source="post: 86270" data-attributes="member: 3218"><p>Just a quick note, maybe it might help someone. When I spoke to Gerald Perry we had discussed Exbal and the Kestrel 4000 unit and at the time I had hung up with him this is what I gathered from our conversation.</p><p></p><p>First if using the Kestrel unit you need to set the BARO reference to "0 ft at sea level" then the unit will give you station pressure which you will put into the box on Exbal for PC in the PRESSURE @ ALTITUDE after you unchecked the box for "calculate std pressure"</p><p></p><p>Then you will also need to put in the Altitude as well to get the most accurate info and you will notice that after you put in Pressure @ Alt and your actual Alt at the top and click someplace else that the Pressure @ Sea-level will change to 29.92 or somewhere very close to this number depending on weather which is actual pressure at sea level. Rather than using the model # of 29.53 inHg which is preloaded in the software.</p><p></p><p>If you do this you will see slight differences in the ballistic tables that are generated. </p><p></p><p>I too use to leave the Alt blank and had to make slight changes to Velocity or Sight Height or to Ball Coef or a little of all to get chart to match actual shooting. I have found that after doing this those charts that are generated seem to be a little closer to everyday shooting at least for me here where I live. I have not since doing this change gone to anyplace with any type of great elevation change to see how predictable it would be by adding in the two new bits of info (Alt and Pressure @ Alt.)</p><p></p><p>This is what the man who made the program (EXBAL) advised me to do and it seems to work. Easy way to tell if it will work for you is to try it. Make one set of drop charts by leaving Alt out then make another set by including them in the equation and see which work best for you. /ubbthreads/images/graemlins/laugh.gif</p><p></p><p>Good luck as this has been very confusing to me as well as so many people have different ways of doing it.</p><p></p><p>Ben</p></blockquote><p></p>
[QUOTE="Glock119, post: 86270, member: 3218"] Just a quick note, maybe it might help someone. When I spoke to Gerald Perry we had discussed Exbal and the Kestrel 4000 unit and at the time I had hung up with him this is what I gathered from our conversation. First if using the Kestrel unit you need to set the BARO reference to "0 ft at sea level" then the unit will give you station pressure which you will put into the box on Exbal for PC in the PRESSURE @ ALTITUDE after you unchecked the box for "calculate std pressure" Then you will also need to put in the Altitude as well to get the most accurate info and you will notice that after you put in Pressure @ Alt and your actual Alt at the top and click someplace else that the Pressure @ Sea-level will change to 29.92 or somewhere very close to this number depending on weather which is actual pressure at sea level. Rather than using the model # of 29.53 inHg which is preloaded in the software. If you do this you will see slight differences in the ballistic tables that are generated. I too use to leave the Alt blank and had to make slight changes to Velocity or Sight Height or to Ball Coef or a little of all to get chart to match actual shooting. I have found that after doing this those charts that are generated seem to be a little closer to everyday shooting at least for me here where I live. I have not since doing this change gone to anyplace with any type of great elevation change to see how predictable it would be by adding in the two new bits of info (Alt and Pressure @ Alt.) This is what the man who made the program (EXBAL) advised me to do and it seems to work. Easy way to tell if it will work for you is to try it. Make one set of drop charts by leaving Alt out then make another set by including them in the equation and see which work best for you. [img]/ubbthreads/images/graemlins/laugh.gif[/img] Good luck as this has been very confusing to me as well as so many people have different ways of doing it. Ben [/QUOTE]
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Altitude vs. Barometric pressure
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