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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Ocular focus & shifting POI... any optics experts here?
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<blockquote data-quote="BallisticsGuy" data-source="post: 1241571" data-attributes="member: 96226"><p>Yes because I know how scopes work and how they're built. Simply stated, ^^^ that's not it. If you're able to elucidate some possible mechanism for this to happen without image distortion then please do.</p><p></p><p>If it were parallax then you'd almost certainly see shot dispersion inside individual groups, not among them. If his cheek weld were consistent enough inside a group not to have parallax induced dispersion then one would think he'd be consistent between sessions. I could see this might not be the case but I'd personally chalk the parallax angle up to a very squishy maybe with some I doubt it frosting. I could be totally incorrect here but it's just not how I've ever seen it work out.</p><p></p><p>Air conditions changing along with OP cleaning the gun before his confirmation group is easily enough to explain it. This is exactly why competitive shooters don't generally clean their guns until the groups open up. There are other possible causes but without being able to interact with the system and data log it anything we come up with is pure conjecture. Anything said here so far also ignores another fact of life. Things change. With rifles being used like laser beams they need to be aligned/calibrated/zero'd (call it what you want) before each use especially after having been transported. </p><p></p><p>Honestly I don't think it's anything to worry about provided you verify POA=POI at the local sighting range one you get to the area you'll hunt. Before every match I shoot we have a sight in period for this exact reason. These are all seasoned competitors and they all pull their rig up to the line and launch a few to make sure everything is on. I will routinely adjust my zero .25MOA or thereabouts from one match to another.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1241571, member: 96226"] Yes because I know how scopes work and how they're built. Simply stated, ^^^ that's not it. If you're able to elucidate some possible mechanism for this to happen without image distortion then please do. If it were parallax then you'd almost certainly see shot dispersion inside individual groups, not among them. If his cheek weld were consistent enough inside a group not to have parallax induced dispersion then one would think he'd be consistent between sessions. I could see this might not be the case but I'd personally chalk the parallax angle up to a very squishy maybe with some I doubt it frosting. I could be totally incorrect here but it's just not how I've ever seen it work out. Air conditions changing along with OP cleaning the gun before his confirmation group is easily enough to explain it. This is exactly why competitive shooters don't generally clean their guns until the groups open up. There are other possible causes but without being able to interact with the system and data log it anything we come up with is pure conjecture. Anything said here so far also ignores another fact of life. Things change. With rifles being used like laser beams they need to be aligned/calibrated/zero'd (call it what you want) before each use especially after having been transported. Honestly I don't think it's anything to worry about provided you verify POA=POI at the local sighting range one you get to the area you'll hunt. Before every match I shoot we have a sight in period for this exact reason. These are all seasoned competitors and they all pull their rig up to the line and launch a few to make sure everything is on. I will routinely adjust my zero .25MOA or thereabouts from one match to another. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Ocular focus & shifting POI... any optics experts here?
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