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Long Range Hunting & Shooting
How does sunlight affect your POI?
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<blockquote data-quote="SBruce" data-source="post: 438886" data-attributes="member: 21068"><p>"Sunlight and it's position relative to the objective lens of the scope will change your point of impact or where the target appears to be"........out of the book <strong>Precision Shooting at 1000 yds</strong> sure seemed to change POI beyond 700 yds in my experiences. The amount is hard to quantify (even by professionals), and I haven't found any "rules of thumb" for it. It's also not accounted for in ballistic programs at all..........even more troublesome for alot of folks on this site (or others I imagine) who can't shoot to 1K until they come out west.</p><p> </p><p>As already mentioned here, I suppose only strict practice and good record keeping will make us able to effectively deal with that variable. Also as mentioned, Mirage has it's own effects on our perception of "where the target is". </p><p> </p><p>Separate from mirage, the general rule of thumb (among 1K benchrest shooters) is supposedly......"sun up, bullet up" meaning that if it's sunny, we'll shoot higher than if it's cloudy. I believe there is some real truth to that too.</p><p> </p><p>Still trying to figure it out myself, because most of my "precision" or even really long range shooting up until recently has been in circumstances where "sighters" are taken...........not an option for Snipers or even Long Range Hunters.</p></blockquote><p></p>
[QUOTE="SBruce, post: 438886, member: 21068"] "Sunlight and it's position relative to the objective lens of the scope will change your point of impact or where the target appears to be"........out of the book [B]Precision Shooting at 1000 yds[/B] sure seemed to change POI beyond 700 yds in my experiences. The amount is hard to quantify (even by professionals), and I haven't found any "rules of thumb" for it. It's also not accounted for in ballistic programs at all..........even more troublesome for alot of folks on this site (or others I imagine) who can't shoot to 1K until they come out west. As already mentioned here, I suppose only strict practice and good record keeping will make us able to effectively deal with that variable. Also as mentioned, Mirage has it's own effects on our perception of "where the target is". Separate from mirage, the general rule of thumb (among 1K benchrest shooters) is supposedly......"sun up, bullet up" meaning that if it's sunny, we'll shoot higher than if it's cloudy. I believe there is some real truth to that too. Still trying to figure it out myself, because most of my "precision" or even really long range shooting up until recently has been in circumstances where "sighters" are taken...........not an option for Snipers or even Long Range Hunters. [/QUOTE]
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How does sunlight affect your POI?
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