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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question on Applied Ballistics App and Coriolis
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<blockquote data-quote="Pdvdh" data-source="post: 1187669" data-attributes="member: 4191"><p>I do agree that spin drift and coriolis quickly become noise in the background of significant crosswinds. Completely agree with that.</p><p></p><p>My comment on coincidental mismanagement of equipment counteracting spin drift and coriolis was then presuming wind free conditions. If a person has windless conditions and doesn't see the combined effects of spin drift and coriolis at 1000yds, then the rifle has been fired in a canted position, the scope isn't mounted parallel to the rifle bore, or some other less than perfect equipment setup or execution has coincidentally (a lark) combined to disguise the left to rightward drift.</p><p></p><p>I didn't mean to imply I knew the left to right drift I experienced was coriolis and spin drift when I first observed it. I didn't have the explanation. So I asked about it on this forum, and continued to investigate potential causes. It was a windless day. I knew the bullets flight path was initially to the left based on the 300yd target impacts. If anything, I expected even further leftward impacts at 1000yds. I NEVER expected rightward impacts, let alone 8-9 inch rightward impacts. That was 8 years ago and I was a novice @1000yds. Very first times I ever shot at 1000yds, as I recall. What I meant to communicate in my prior post was that the effects of spin drift, combined with coriolis drift, were plainly apparent on targets from two different rifles on my very first engagements of a 1000yd target. Not that I knew the cause for the rightward drift. In fact I didn't know the cause, but the rightward bullet drift was very obvious.</p><p></p><p>Those initial experiences were the beginning of my spin drift and coriolis education. Here's the Thread I started back in November 2008. </p><p><a href="http://www.longrangehunting.com/forums/f17/left-300-yds-right-1000-yds-wth-35255/" target="_blank">http://www.longrangehunting.com/forums/f17/left-300-yds-right-1000-yds-wth-35255/</a></p><p>It's very clear in that Thread that I didn't have the explanation, but was on a mission to understand how my bullets could strike left at 300yds, and then right at 1000yds, in wind free conditions.</p><p></p><p>Pretty certain you have a lot more wind than I have where I live, shoot, and hunt. We have some wind, but we also have our share of little to no wind days. </p><p></p><p>To clarify, 8 years later, when I shoot in wind free conditions now (a few times I've been out when light snow was lazily falling straight down, from muzzle out to the 1000yd target), I expect to see rightward movement of my bullet caused by the combined effects of spin drift/coriolis. If I don't, I know my equipment isn't properly assembled, and/or fired, "plumb" with gravitational force. Left to right drift was so obvious between my 300yd target and 1000yd target, that I couldn't overlook or deny it. I couldn't rest until I identified the cause.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1187669, member: 4191"] I do agree that spin drift and coriolis quickly become noise in the background of significant crosswinds. Completely agree with that. My comment on coincidental mismanagement of equipment counteracting spin drift and coriolis was then presuming wind free conditions. If a person has windless conditions and doesn't see the combined effects of spin drift and coriolis at 1000yds, then the rifle has been fired in a canted position, the scope isn't mounted parallel to the rifle bore, or some other less than perfect equipment setup or execution has coincidentally (a lark) combined to disguise the left to rightward drift. I didn't mean to imply I knew the left to right drift I experienced was coriolis and spin drift when I first observed it. I didn't have the explanation. So I asked about it on this forum, and continued to investigate potential causes. It was a windless day. I knew the bullets flight path was initially to the left based on the 300yd target impacts. If anything, I expected even further leftward impacts at 1000yds. I NEVER expected rightward impacts, let alone 8-9 inch rightward impacts. That was 8 years ago and I was a novice @1000yds. Very first times I ever shot at 1000yds, as I recall. What I meant to communicate in my prior post was that the effects of spin drift, combined with coriolis drift, were plainly apparent on targets from two different rifles on my very first engagements of a 1000yd target. Not that I knew the cause for the rightward drift. In fact I didn't know the cause, but the rightward bullet drift was very obvious. Those initial experiences were the beginning of my spin drift and coriolis education. Here's the Thread I started back in November 2008. [url]http://www.longrangehunting.com/forums/f17/left-300-yds-right-1000-yds-wth-35255/[/url] It's very clear in that Thread that I didn't have the explanation, but was on a mission to understand how my bullets could strike left at 300yds, and then right at 1000yds, in wind free conditions. Pretty certain you have a lot more wind than I have where I live, shoot, and hunt. We have some wind, but we also have our share of little to no wind days. To clarify, 8 years later, when I shoot in wind free conditions now (a few times I've been out when light snow was lazily falling straight down, from muzzle out to the 1000yd target), I expect to see rightward movement of my bullet caused by the combined effects of spin drift/coriolis. If I don't, I know my equipment isn't properly assembled, and/or fired, "plumb" with gravitational force. Left to right drift was so obvious between my 300yd target and 1000yd target, that I couldn't overlook or deny it. I couldn't rest until I identified the cause. [/QUOTE]
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Question on Applied Ballistics App and Coriolis
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