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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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<blockquote data-quote="Brent" data-source="post: 74085" data-attributes="member: 99"><p>Michael,</p><p></p><p>I run some numbers for a guy there in Florida a couple years ago, as he was heading to Colorado hunting and I stumbled upon the same head scratching issue you did. I've Never called Jim to ask him about it simply because It was a 10,000 foot change and I didn't anticipate having to deal with that just yet, still it did not seem correct, still doesn't, but I'm sure Jim understands why there is a difference in output on the RSI program, or could find out.</p><p></p><p>I set the Kestrel 4000 to 0 feet referance to get station pressure and use it with a 0 altitude in the ballistic program, if anything other than zero is entered for altitude when you are already using station presure (pressure at altitude) the ballistic program will reduce the pressure once again, or two fold. If all one has access to is weather report data for daily pressure it must be reduced for your altitude by the program, thus an altitude needs to be entered along with this pressure at sea level in order to be accurate.</p><p></p><p>29.92 or 29.53.... to be quite honest, I'm still a little confused over this one here and have been for a while. Anyone care to shed a little light on the origin of the two?</p></blockquote><p></p>
[QUOTE="Brent, post: 74085, member: 99"] Michael, I run some numbers for a guy there in Florida a couple years ago, as he was heading to Colorado hunting and I stumbled upon the same head scratching issue you did. I've Never called Jim to ask him about it simply because It was a 10,000 foot change and I didn't anticipate having to deal with that just yet, still it did not seem correct, still doesn't, but I'm sure Jim understands why there is a difference in output on the RSI program, or could find out. I set the Kestrel 4000 to 0 feet referance to get station pressure and use it with a 0 altitude in the ballistic program, if anything other than zero is entered for altitude when you are already using station presure (pressure at altitude) the ballistic program will reduce the pressure once again, or two fold. If all one has access to is weather report data for daily pressure it must be reduced for your altitude by the program, thus an altitude needs to be entered along with this pressure at sea level in order to be accurate. 29.92 or 29.53.... to be quite honest, I'm still a little confused over this one here and have been for a while. Anyone care to shed a little light on the origin of the two? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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