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Hunting
The Basics, Starting Out
what does the weather do to a rifle.
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<blockquote data-quote="Brent" data-source="post: 56503" data-attributes="member: 99"><p>If it's just air temperature that changes, I've found about 1/4 MOA lower POI for every 10 deg F. drop in temp, that's just what I've found... Of course, if the barometric pressure drops at the same time, it may be enough to cancel out part, or all of the effect of the temp drop. Air temp and BP both alter the density of air, this is what is altering your trajectory. Your ammo temperature dropping can also reduce MV and then it will also contribute to a POI shift.</p></blockquote><p></p>
[QUOTE="Brent, post: 56503, member: 99"] If it's just air temperature that changes, I've found about 1/4 MOA lower POI for every 10 deg F. drop in temp, that's just what I've found... Of course, if the barometric pressure drops at the same time, it may be enough to cancel out part, or all of the effect of the temp drop. Air temp and BP both alter the density of air, this is what is altering your trajectory. Your ammo temperature dropping can also reduce MV and then it will also contribute to a POI shift. [/QUOTE]
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The Basics, Starting Out
what does the weather do to a rifle.
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