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Hunting
Long Range Hunting & Shooting
affect of ambient temp on velocity?
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<blockquote data-quote="X-man" data-source="post: 807212" data-attributes="member: 8416"><p>There are two separate parts to the temperature equation here.</p><p>Air density and powder temperature.</p><p></p><p>The ballistic program is calculating for air density. Temperature changes the air density.</p><p></p><p>The ballistic program can not help you with changes in velocity as a result of powder temperature. This data need to be known by you and factored in to the correction independently from air temperature/density. Depending on the range you are shooting you may want more corrective information that 1 fps per 1 degree of temp.</p><p></p><p>Changes in powder temperature quite often move POI horizontally as well as vertically. This is why experienced shooters keep a shot data log book. My 300Win moves about 1/2 MOA left for a 30 degree increase in temperature.</p></blockquote><p></p>
[QUOTE="X-man, post: 807212, member: 8416"] There are two separate parts to the temperature equation here. Air density and powder temperature. The ballistic program is calculating for air density. Temperature changes the air density. The ballistic program can not help you with changes in velocity as a result of powder temperature. This data need to be known by you and factored in to the correction independently from air temperature/density. Depending on the range you are shooting you may want more corrective information that 1 fps per 1 degree of temp. Changes in powder temperature quite often move POI horizontally as well as vertically. This is why experienced shooters keep a shot data log book. My 300Win moves about 1/2 MOA left for a 30 degree increase in temperature. [/QUOTE]
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affect of ambient temp on velocity?
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