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Long Range Hunting & Shooting
group shifting question
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<blockquote data-quote="Pdvdh" data-source="post: 345157" data-attributes="member: 4191"><p>I experience some of this with my rifles also, and I've never really figured it out. Some of these rifles are stable platforms, built and bedded by quality smiths. And I'm using stout one-piece Picatinny bases and stout rings, lapping the lower rings and taking great pains and care to ensure the scope is mounted without strain, and straight with & directly over the bore.</p><p></p><p>I've read that different lighting conditions can actually cause some differences in point of impact (POI) from point of aim (POA). I've never demonstrated that effect to myself but I've never tried. I believe lighting and air conditions can cause error. Most have experienced the grief cause by heat mirage as the rifle lays still and the reticle moves around the bullseye. I don't know how much error is theoretically possible to due different angles of sunshine or lighting conditions - without heat mirage. It may not be enough to amount to a hoot of difference. </p><p></p><p>I'm not sure how much your POI is changing versus POA. If it's just a slight correction that varies in different directions on different days, then maybe??? If your POI versus POA moves any substantial distance - like more than 1 MOA, or it continues to drift in any one direction, then I think something else is amiss.</p><p></p><p>Perhaps some expert on light and the effects it can have on POI versus a fixed POA will sound in and educate on the maximum theoretical error lighting conditions could cause. I'd think the benchrest crowd should know something about this, but maybe not. They do get to take some warmup shots so perhaps they just adjust for the conditions of the day and give it no more thought. I'd sure like to know more about this so I could determine whether or not the amount of shift I experience is cause for concern over the equipment, or beyond my control.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 345157, member: 4191"] I experience some of this with my rifles also, and I've never really figured it out. Some of these rifles are stable platforms, built and bedded by quality smiths. And I'm using stout one-piece Picatinny bases and stout rings, lapping the lower rings and taking great pains and care to ensure the scope is mounted without strain, and straight with & directly over the bore. I've read that different lighting conditions can actually cause some differences in point of impact (POI) from point of aim (POA). I've never demonstrated that effect to myself but I've never tried. I believe lighting and air conditions can cause error. Most have experienced the grief cause by heat mirage as the rifle lays still and the reticle moves around the bullseye. I don't know how much error is theoretically possible to due different angles of sunshine or lighting conditions - without heat mirage. It may not be enough to amount to a hoot of difference. I'm not sure how much your POI is changing versus POA. If it's just a slight correction that varies in different directions on different days, then maybe??? If your POI versus POA moves any substantial distance - like more than 1 MOA, or it continues to drift in any one direction, then I think something else is amiss. Perhaps some expert on light and the effects it can have on POI versus a fixed POA will sound in and educate on the maximum theoretical error lighting conditions could cause. I'd think the benchrest crowd should know something about this, but maybe not. They do get to take some warmup shots so perhaps they just adjust for the conditions of the day and give it no more thought. I'd sure like to know more about this so I could determine whether or not the amount of shift I experience is cause for concern over the equipment, or beyond my control. [/QUOTE]
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