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Long Range Hunting & Shooting
Left @ 300 yds - Right @ 1000 yds? WTH?
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<blockquote data-quote="Pdvdh" data-source="post: 254350" data-attributes="member: 4191"><p>I used levels on the receivers of both of my rifles to ensure the barreled receivers were leveled. I hung a plumb bob about 50 yds away and then aligned the vertical crosshair of my scopes with the plumb bob string. In addition, I had to true up the scope bases on my 7mm Rem Mag because the scope was mounted pointing slightly to the right. Then I purchased and installed bubble levels on both rifles to minimize any canting. Lastly, a 1 mph crosswind can produce as much drift at 1000 yds as spindrift. So you have to shoot in absolutely windless conditions. When I shot there was a light snow falling vertical - straight down. I checked it multiple times at multiple locations. No observable wind whatsoever. After everything was trued up and plumbed level with the world, both of my rifles produced the spin drift I identified in my prior posts. And my total left to right drift experienced at 990 yds was a very close match to the sum of the typical <strong>spindrift</strong> experienced with VLD match bullets, <strong>plus</strong> the LoadBase 2.0 calculated <strong>coriolis drift</strong>. Which is why you can count me in the believer's camp. I had a little more rightward drift than could be explained by spindrift alone. When I calculated the Coriolis drift and added it to spindrift, I had virtually a perfect match with my measured rightward drift..</p><p></p><p>If you experience no rightward bullet drift at 1000 yds, then you should consider yourself amongst the blessed. Because I believe if you've got everything set up plumb and proper, and you don't cant your rifle, you should be experiencing enough rightward drift at that distance to be able to visually confirm it on the range. </p><p></p><p>Zero in at 1000 yds in windless conditions and then shoot about a 3-shot group to confirm your left-right zero at that range. Next shoot at about 200 yds and observe how far left your bullets group from point of aim. If they're also dead on at 200 yds then you've either violated scientifically proven causes of rightward drift, or your scope isn't mounted plumb and straight with your barreled receiver, or you canted your rifle just enough to compensate for the rightward drift that your bullet experienced covering those 1000 yds, or there was a slight 3:00 wind that was drifting your bullet leftward, or some combination of these factors exactly countered the rightward bullet drift. That's my take on it from what I've read and researched, and then personally experienced with two different rifles - both shooting Berger VLD match bullets. </p><p></p><p>If your not getting any rightward drift out in the field with your rifle, then you certainly shouldn't factor any right-drift dope into your long range shots.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 254350, member: 4191"] I used levels on the receivers of both of my rifles to ensure the barreled receivers were leveled. I hung a plumb bob about 50 yds away and then aligned the vertical crosshair of my scopes with the plumb bob string. In addition, I had to true up the scope bases on my 7mm Rem Mag because the scope was mounted pointing slightly to the right. Then I purchased and installed bubble levels on both rifles to minimize any canting. Lastly, a 1 mph crosswind can produce as much drift at 1000 yds as spindrift. So you have to shoot in absolutely windless conditions. When I shot there was a light snow falling vertical - straight down. I checked it multiple times at multiple locations. No observable wind whatsoever. After everything was trued up and plumbed level with the world, both of my rifles produced the spin drift I identified in my prior posts. And my total left to right drift experienced at 990 yds was a very close match to the sum of the typical [B]spindrift[/B] experienced with VLD match bullets, [B]plus[/B] the LoadBase 2.0 calculated [B]coriolis drift[/B]. Which is why you can count me in the believer's camp. I had a little more rightward drift than could be explained by spindrift alone. When I calculated the Coriolis drift and added it to spindrift, I had virtually a perfect match with my measured rightward drift.. If you experience no rightward bullet drift at 1000 yds, then you should consider yourself amongst the blessed. Because I believe if you've got everything set up plumb and proper, and you don't cant your rifle, you should be experiencing enough rightward drift at that distance to be able to visually confirm it on the range. Zero in at 1000 yds in windless conditions and then shoot about a 3-shot group to confirm your left-right zero at that range. Next shoot at about 200 yds and observe how far left your bullets group from point of aim. If they're also dead on at 200 yds then you've either violated scientifically proven causes of rightward drift, or your scope isn't mounted plumb and straight with your barreled receiver, or you canted your rifle just enough to compensate for the rightward drift that your bullet experienced covering those 1000 yds, or there was a slight 3:00 wind that was drifting your bullet leftward, or some combination of these factors exactly countered the rightward bullet drift. That's my take on it from what I've read and researched, and then personally experienced with two different rifles - both shooting Berger VLD match bullets. If your not getting any rightward drift out in the field with your rifle, then you certainly shouldn't factor any right-drift dope into your long range shots. [/QUOTE]
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Left @ 300 yds - Right @ 1000 yds? WTH?
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