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Long Range Hunting & Shooting
Long Range shots - elevation right on always to the right
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<blockquote data-quote="Pdvdh" data-source="post: 540358" data-attributes="member: 4191"><p>For NVH1, </p><p>I hope you sort out the issues with your rightward bullet drift. As others have mentioned, the equipment needs to be set up and functioning correctly. It's pretty darn important that you not be canting your rifle. I use anti-cant bubble level devices on my rifles to help ensure I'm not canting the barreled action clockwise or counterclockwise. On uneven ground, like on hill sides and mountain sides, I was surprised to learn how much cant I was causing just relying on my eyes' sense of vertical and horizontal - after I added the anti-cant device to my rifles. Canting the rifle can be a large source of bullet drift.</p><p></p><p>And to be really sure the drift you're experiencing is real, it's important to shoot on windless days, since as mentioned, even a 1 mph cross wind will cause drift to the extent that you've experienced.</p><p></p><p>A big reason I think your equipment is set up and functioning close to correct, is that the quantities of drift you've experienced are pretty much in line with what one should expect to see if all equipment is set up perfectly, functioning perfectly, and cant free. So I suspect Spin and Coriolis drift explain the majority of your experienced drift.</p><p></p><p>Honestly, I don't understand why every long range shooter doesn't experience the same thing you've just encountered. It's the first thing I experienced when I stepped back to 1000 yards and started finding points of impact 10" right of my point of aim, when my 300 yard zero was dead nutz on - left and right. I shot a few more times at both 300 yards and 1000 yards again. What sealed my conclusion was when I was able to shoot in a light snow fall, and I could confirm the environment was wind free over the entire 1000 yard range from the rifle to the target. I even walked the range to observe the snow falling straight down. At that point I posted a Thread on this Forum as you have, requesting assistance in identifying the source of rightward drift.</p><p></p><p>One of my two rifles didn't have the scope tube mounted correctly aligned with the barreled action. It was causing excessive rightward drift. After I corrected that problem, mounted the anti-cant devices and shot some more, both rifles produced around 9 to 11" of rightward drift. To get the rifles to print on the money at 1000 yds, I had to adjust my zero at 300 yds to hit about 1 inch left. </p><p></p><p>So I researched and researched and learned about Coriolis and Spin Drift. Acquired some ballistic software. Low and behold, the rightward drift I experience is just about exactly as predicted and accounted for with Coriolis and Spin Drift - when combined. I live at 60 degrees North Latitude, and Coriolis drift is just a little greater here than at 45 degrees Latitude. Finally, some peace of mind.</p><p></p><p>I have since experienced Coriolis and Spin Drift repetitively, with additional rifles. I suspect the reason some members fail to experience these sources of drift is because their equipment isn't set up or functioning properly, it's commonly too windy where they shoot to be able to discern these sources of drift from the cross wind-caused drift, or they have a natural cant to their rifle that by luck or happenstance, happens to offset these sources of drift.</p><p></p><p>Once a shooter recognizes and accepts these sources of drift, there are any number of ways to account/dope for them. At that point, the methods for doping for them is largely a matter of personal preference.</p><p></p><p>Hope all the <em>chatter</em> here didn't scare you away. Good luck.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 540358, member: 4191"] For NVH1, I hope you sort out the issues with your rightward bullet drift. As others have mentioned, the equipment needs to be set up and functioning correctly. It's pretty darn important that you not be canting your rifle. I use anti-cant bubble level devices on my rifles to help ensure I'm not canting the barreled action clockwise or counterclockwise. On uneven ground, like on hill sides and mountain sides, I was surprised to learn how much cant I was causing just relying on my eyes' sense of vertical and horizontal - after I added the anti-cant device to my rifles. Canting the rifle can be a large source of bullet drift. And to be really sure the drift you're experiencing is real, it's important to shoot on windless days, since as mentioned, even a 1 mph cross wind will cause drift to the extent that you've experienced. A big reason I think your equipment is set up and functioning close to correct, is that the quantities of drift you've experienced are pretty much in line with what one should expect to see if all equipment is set up perfectly, functioning perfectly, and cant free. So I suspect Spin and Coriolis drift explain the majority of your experienced drift. Honestly, I don't understand why every long range shooter doesn't experience the same thing you've just encountered. It's the first thing I experienced when I stepped back to 1000 yards and started finding points of impact 10" right of my point of aim, when my 300 yard zero was dead nutz on - left and right. I shot a few more times at both 300 yards and 1000 yards again. What sealed my conclusion was when I was able to shoot in a light snow fall, and I could confirm the environment was wind free over the entire 1000 yard range from the rifle to the target. I even walked the range to observe the snow falling straight down. At that point I posted a Thread on this Forum as you have, requesting assistance in identifying the source of rightward drift. One of my two rifles didn't have the scope tube mounted correctly aligned with the barreled action. It was causing excessive rightward drift. After I corrected that problem, mounted the anti-cant devices and shot some more, both rifles produced around 9 to 11" of rightward drift. To get the rifles to print on the money at 1000 yds, I had to adjust my zero at 300 yds to hit about 1 inch left. So I researched and researched and learned about Coriolis and Spin Drift. Acquired some ballistic software. Low and behold, the rightward drift I experience is just about exactly as predicted and accounted for with Coriolis and Spin Drift - when combined. I live at 60 degrees North Latitude, and Coriolis drift is just a little greater here than at 45 degrees Latitude. Finally, some peace of mind. I have since experienced Coriolis and Spin Drift repetitively, with additional rifles. I suspect the reason some members fail to experience these sources of drift is because their equipment isn't set up or functioning properly, it's commonly too windy where they shoot to be able to discern these sources of drift from the cross wind-caused drift, or they have a natural cant to their rifle that by luck or happenstance, happens to offset these sources of drift. Once a shooter recognizes and accepts these sources of drift, there are any number of ways to account/dope for them. At that point, the methods for doping for them is largely a matter of personal preference. Hope all the [I]chatter[/I] here didn't scare you away. Good luck. [/QUOTE]
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Long Range shots - elevation right on always to the right
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