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Hunting
Long Range Hunting & Shooting
Altitude & Temperature Effects on a Bullet?
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<blockquote data-quote="sierra22" data-source="post: 64654" data-attributes="member: 949"><p>Shadowman, good to see other people also using pressure.</p><p>Your variations for february corresponds very well with what I'm seeing at my part of the globe. (28.43-30.43 "Hg = 962-1030 hPa)</p><p></p><p>I also use raw/uncorrected pressure or whatever the correct word would be. At present I'm shooting a 6,5mm 120gr SMK as slowly as possibly in order to determine the accuracy of my calculations, the my theory being that a slower bullet will be more adversely affected by this pressure, and thus easier to check.</p><p></p><p>I also calculate velocity loss due ammo temperature. I freeze a batch of ammo, put it in a cooler bag (to let the ammo slowly warm up) and shoot a few rounds over the chrony at 5Celsius intervals. Not scientifically accurate, but it gives me a fair idea.</p><p></p><p>I also calculate trajectory based on airtemp, but I'm somewhat uncertain wether this is necessary as I use pressure and ammo temp already</p></blockquote><p></p>
[QUOTE="sierra22, post: 64654, member: 949"] Shadowman, good to see other people also using pressure. Your variations for february corresponds very well with what I'm seeing at my part of the globe. (28.43-30.43 "Hg = 962-1030 hPa) I also use raw/uncorrected pressure or whatever the correct word would be. At present I'm shooting a 6,5mm 120gr SMK as slowly as possibly in order to determine the accuracy of my calculations, the my theory being that a slower bullet will be more adversely affected by this pressure, and thus easier to check. I also calculate velocity loss due ammo temperature. I freeze a batch of ammo, put it in a cooler bag (to let the ammo slowly warm up) and shoot a few rounds over the chrony at 5Celsius intervals. Not scientifically accurate, but it gives me a fair idea. I also calculate trajectory based on airtemp, but I'm somewhat uncertain wether this is necessary as I use pressure and ammo temp already [/QUOTE]
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Altitude & Temperature Effects on a Bullet?
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