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Hunting
Long Range Hunting & Shooting
Different State - POI Change....is this normal?
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<blockquote data-quote="DKSDonnie" data-source="post: 1632430" data-attributes="member: 102446"><p>In my experience, the change of 2,100' in altitude would not make a noticeable change. I would suspect the 40 deg temp change had more of an effect. I have a 7MM WSM I was reloading and shooting for and shot sub 1/2 groups at 100 yds easily in 40 deg temps. Warmer weather came along and shot it again at right around 80 deg and was in the shade. It shot 2.5" to 3" groups and consistently walked dead left after each shot. I was sure not to cook the casings in the chamber after each shot and let it cool for at least 10 min after each shot but it still went crazy. My fps did rise after each shot through the chrono. Heat brings pressures up which changes fps which changes harmonics and obviously POI. Check your fps in 40 deg temps versus 80 deg temps and I think you'll find your answer. </p><p>'</p></blockquote><p></p>
[QUOTE="DKSDonnie, post: 1632430, member: 102446"] In my experience, the change of 2,100' in altitude would not make a noticeable change. I would suspect the 40 deg temp change had more of an effect. I have a 7MM WSM I was reloading and shooting for and shot sub 1/2 groups at 100 yds easily in 40 deg temps. Warmer weather came along and shot it again at right around 80 deg and was in the shade. It shot 2.5" to 3" groups and consistently walked dead left after each shot. I was sure not to cook the casings in the chamber after each shot and let it cool for at least 10 min after each shot but it still went crazy. My fps did rise after each shot through the chrono. Heat brings pressures up which changes fps which changes harmonics and obviously POI. Check your fps in 40 deg temps versus 80 deg temps and I think you'll find your answer. ' [/QUOTE]
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Different State - POI Change....is this normal?
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