Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Hunting
Long Range Hunting & Shooting
Long Range shots - elevation right on always to the right
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Pdvdh" data-source="post: 540230" data-attributes="member: 4191"><p>I researched the affect of left and right crosswind-caused vertical drift several years ago, but didn't relegate it to memory, because the quantity of up or down drift was deemed inconsequential for large game hunting. We've already heard from some members that either don't believe in Spin drift or Coriolis drift, or they consider the magnitudes of these sources of drift to be de minimis - insignificant. I don't delegate either Spin or Coriolis drift to de minimus status. But I do delegate the crosswind-caused vertical drift that you refer to - to de minimis status. Interestingly enough, I have read that some long range bench rest competitors commonly dope for this source of vertical drift. When the thickness of a few human hairs separates the winner from the rest of the competitors, I guess every little advantage counts.</p><p></p><p>Your question caused me to run some strong crosswinds through my LoadBase3.0 ballistics software, and I can officially state that it produced no affect on the predicted magnitudes of Spin Drift. My guess is there's no programming built into LoadBase3.0 software, or any other small arms ballistic software, for purposes of calculating or compensating for this relatively minor source of bullet drift. </p><p></p><p>However in the process of playing with my ballistics software, I learned that a 10 mph headwind will increase Spin Drift by approximately 0.2 inches at 1000 yds (from 6.6 inches to 6.8 inches) and a 10 mph tailwind will decrease Spin Drift by the same amount. A torrid 60 mph head wind will increase Spin Drift at 1000 yds by about 1.3 inches (from 6.6 inches to 7.9 inches), whereas a 60 mph tailwind will decrease Spin Drift by about 1.1 inches at 1000 yds. Not necessarily all that useful in real life hunting scenarios, but interesting non-the-less. I suspect the primary reason for the increased and decreased spin drift is due to the slightly increased and decreased times of flight, compared to windless conditions. The bullet's Spin Drift is effective for a slightly increased or decreased time-in-flight.</p><p></p><p>We haven't heard from the OP for quite a few Posts now. I hope we didn't put him into an information overload-caused state of mental stupor. At this point, he can accept that Spin and Coriolis drift could largely be responsible for the rightward drift, or take a pipe bender to his scope tube or barreled action and bend the drift in the opposite direction... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>At least a few of our members concur with tweaking the curvature of the scope tube. Not to change the subject, but I have heard it rumored that Osmosis can cause bullet drift... Seriously!. . . <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="Pdvdh, post: 540230, member: 4191"] I researched the affect of left and right crosswind-caused vertical drift several years ago, but didn't relegate it to memory, because the quantity of up or down drift was deemed inconsequential for large game hunting. We've already heard from some members that either don't believe in Spin drift or Coriolis drift, or they consider the magnitudes of these sources of drift to be de minimis - insignificant. I don't delegate either Spin or Coriolis drift to de minimus status. But I do delegate the crosswind-caused vertical drift that you refer to - to de minimis status. Interestingly enough, I have read that some long range bench rest competitors commonly dope for this source of vertical drift. When the thickness of a few human hairs separates the winner from the rest of the competitors, I guess every little advantage counts. Your question caused me to run some strong crosswinds through my LoadBase3.0 ballistics software, and I can officially state that it produced no affect on the predicted magnitudes of Spin Drift. My guess is there's no programming built into LoadBase3.0 software, or any other small arms ballistic software, for purposes of calculating or compensating for this relatively minor source of bullet drift. However in the process of playing with my ballistics software, I learned that a 10 mph headwind will increase Spin Drift by approximately 0.2 inches at 1000 yds (from 6.6 inches to 6.8 inches) and a 10 mph tailwind will decrease Spin Drift by the same amount. A torrid 60 mph head wind will increase Spin Drift at 1000 yds by about 1.3 inches (from 6.6 inches to 7.9 inches), whereas a 60 mph tailwind will decrease Spin Drift by about 1.1 inches at 1000 yds. Not necessarily all that useful in real life hunting scenarios, but interesting non-the-less. I suspect the primary reason for the increased and decreased spin drift is due to the slightly increased and decreased times of flight, compared to windless conditions. The bullet's Spin Drift is effective for a slightly increased or decreased time-in-flight. We haven't heard from the OP for quite a few Posts now. I hope we didn't put him into an information overload-caused state of mental stupor. At this point, he can accept that Spin and Coriolis drift could largely be responsible for the rightward drift, or take a pipe bender to his scope tube or barreled action and bend the drift in the opposite direction... :D At least a few of our members concur with tweaking the curvature of the scope tube. Not to change the subject, but I have heard it rumored that Osmosis can cause bullet drift... Seriously!. . . :D :D [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
Long Range shots - elevation right on always to the right
Top