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Long Range Hunting & Shooting
Altitude & Temperature Effects on a Bullet?
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<blockquote data-quote="Glock119" data-source="post: 64208" data-attributes="member: 3218"><p>[ QUOTE ]</p><p> Altitude is of little value without measuring actual air pressure. </p><p></p><p>[/ QUOTE ] </p><p></p><p>Sierra22, actually altitude has no value, at least for me, the way I run the #'s through Exbal. For me I had used them as a guideline to help me get close to a pressure close to his. For example we hunt in Maine at an alt of 4328' and took the barometric pressures we had for there and plugged them in for his 4500'</p><p></p><p>Now, although this is not exact, this will put me in the ball game at least for the illustration purposes needed for his post. I nolonger use altitude in any of my calculations only the barometric pressure, as not only does this change for elevation it also changes with the weather, so this is the best method to use to get the most accurate ballistic data.</p><p></p><p>Here in NY at 830' above sea level during the month of Feb my Kestrel 4000 said the average barometric pressure was 29.43inHg with a high of 30.34inHg and a low of 28.43inHg but this changes with the seasons and as the weather changes. </p><p></p><p>So one can see that even though I had not moved, the pressure had a pretty good swing and if I had sighted in while the pressure was 28.43inHg and then took shots at game while the barometric pressure was at 30.34inHg without running the numbers again I would be 2.4" off at 500yrds and 22.9" at 1000yrds even though nothing else had changed.</p><p></p><p>Thanks,</p><p>Ben</p></blockquote><p></p>
[QUOTE="Glock119, post: 64208, member: 3218"] [ QUOTE ] Altitude is of little value without measuring actual air pressure. [/ QUOTE ] Sierra22, actually altitude has no value, at least for me, the way I run the #'s through Exbal. For me I had used them as a guideline to help me get close to a pressure close to his. For example we hunt in Maine at an alt of 4328' and took the barometric pressures we had for there and plugged them in for his 4500' Now, although this is not exact, this will put me in the ball game at least for the illustration purposes needed for his post. I nolonger use altitude in any of my calculations only the barometric pressure, as not only does this change for elevation it also changes with the weather, so this is the best method to use to get the most accurate ballistic data. Here in NY at 830' above sea level during the month of Feb my Kestrel 4000 said the average barometric pressure was 29.43inHg with a high of 30.34inHg and a low of 28.43inHg but this changes with the seasons and as the weather changes. So one can see that even though I had not moved, the pressure had a pretty good swing and if I had sighted in while the pressure was 28.43inHg and then took shots at game while the barometric pressure was at 30.34inHg without running the numbers again I would be 2.4" off at 500yrds and 22.9" at 1000yrds even though nothing else had changed. Thanks, Ben [/QUOTE]
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