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Rifles, Reloading, Optics, Equipment
Reloading
Switching bullets effecting zero?
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<blockquote data-quote="User4302021" data-source="post: 1902558" data-attributes="member: 105322"><p>None of that is a given. It depends on where the thermal interfaces are in relation to the target and the angle of the sun.</p><p></p><p>In the example I mentioned, the deep shaded valley was a cooler body of air about 400 yards deep, and the sun was skipping of the surface of it as if it were a pane of glass. The target was 800 yards away in the bottom of the valley. Our bullets, which had been hammering that exact target with regularity 4 hours earlier, were now 1mil high.</p><p></p><p>Less extreme examples would be like what I was seeing just a couple days ago. I was on a flat 200 yards range, and the sun was peeking in and out of heavy clouds. My POI formed 2 distinct groups, one 1 moa above the other, with all rounds fired under cloud cover going high.</p><p></p><p>When you dope your rifle, confirm zero in the exact conditions you are going to dope in. If you can zero and dope your rifle under gray skies, so much the better. Next best thing is very early in the morning before the sun gets strong.</p></blockquote><p></p>
[QUOTE="User4302021, post: 1902558, member: 105322"] None of that is a given. It depends on where the thermal interfaces are in relation to the target and the angle of the sun. In the example I mentioned, the deep shaded valley was a cooler body of air about 400 yards deep, and the sun was skipping of the surface of it as if it were a pane of glass. The target was 800 yards away in the bottom of the valley. Our bullets, which had been hammering that exact target with regularity 4 hours earlier, were now 1mil high. Less extreme examples would be like what I was seeing just a couple days ago. I was on a flat 200 yards range, and the sun was peeking in and out of heavy clouds. My POI formed 2 distinct groups, one 1 moa above the other, with all rounds fired under cloud cover going high. When you dope your rifle, confirm zero in the exact conditions you are going to dope in. If you can zero and dope your rifle under gray skies, so much the better. Next best thing is very early in the morning before the sun gets strong. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Switching bullets effecting zero?
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