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Long Range Hunting & Shooting
Light- and it's effects on POI
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<blockquote data-quote="Michael Eichele" data-source="post: 247489" data-attributes="member: 1007"><p>Over the years I have always noticed that my POI would change day to day most of the time but not always. The changes were ussually concistent. My POI was either high and left or low and right if it wasnt dead on. </p><p></p><p>A couple of years ago I had developed a load for my 300 RUM and zeroed it 300 yards. I went to the range a couple times aweek for a month or so. Everytime I went it was cloudy. I noticed my POI never changed. I thought that was strange that every time I went to the range my POI didnt move. Then one day I went and it was sunny. Guess what? It changed. it was low and right. I still didnt make the connection. I rezeroed my rifle and the next time I went to the range I was high left. Still didnt get it. </p><p></p><p>Then one day I went with my 308. I shot a group at 300 yards and it was dead on. It was very cloudy. With in seconds, the clouds parted and became VERY sunny. The sun was shining bright on my target. Guess what, the next group was low right. It became clear to me at that point why my POI was changing. Now I document if I sighted in during very bright sunny conditions or cloudy conditions. Typically I sight in during cloudy conditions because we have so many gloomy days up here. Then I know if I am setting up on a shot in bright daylight I readjust my zero a 1/4 MOA up and 1/2 MOA left. In other words when I sight in for cloudy and it becomes bright, my POI changes to low right. .25x.5 MOA.</p><p></p><p>It is more complicated than that for EXACT POI changes. It matters where the sun is. But the bulk of the changes will happen between gloomy and bright.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 247489, member: 1007"] Over the years I have always noticed that my POI would change day to day most of the time but not always. The changes were ussually concistent. My POI was either high and left or low and right if it wasnt dead on. A couple of years ago I had developed a load for my 300 RUM and zeroed it 300 yards. I went to the range a couple times aweek for a month or so. Everytime I went it was cloudy. I noticed my POI never changed. I thought that was strange that every time I went to the range my POI didnt move. Then one day I went and it was sunny. Guess what? It changed. it was low and right. I still didnt make the connection. I rezeroed my rifle and the next time I went to the range I was high left. Still didnt get it. Then one day I went with my 308. I shot a group at 300 yards and it was dead on. It was very cloudy. With in seconds, the clouds parted and became VERY sunny. The sun was shining bright on my target. Guess what, the next group was low right. It became clear to me at that point why my POI was changing. Now I document if I sighted in during very bright sunny conditions or cloudy conditions. Typically I sight in during cloudy conditions because we have so many gloomy days up here. Then I know if I am setting up on a shot in bright daylight I readjust my zero a 1/4 MOA up and 1/2 MOA left. In other words when I sight in for cloudy and it becomes bright, my POI changes to low right. .25x.5 MOA. It is more complicated than that for EXACT POI changes. It matters where the sun is. But the bulk of the changes will happen between gloomy and bright. [/QUOTE]
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