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
Left @ 300 yds - Right @ 1000 yds? WTH?
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: 2666626" data-attributes="member: 4191"><p>An old thread with lots of moss on it now. But still a pertinent thread.</p><p></p><p>I live and shoot at 62 degrees N Latitude. I've since learned the cause of my rightward shifts in POI.</p><p></p><p>Coriolis drift caused ~3 - 4" of my left to right drift at 1000yds.</p><p></p><p>Spin drift caused an additional ~6" rightward drift.</p><p></p><p>Back when I started this thread, most members were unaware of those two causes of rightward bullet drift. Some may still deny those causes exist today. I regularly see both causes in play. At my northern latitude, Coriolis drift is more significant than in western States. Rightward spin drift? That's present everywhere, from barrels with right twist rifling.</p><p></p><p>The only reason I can think of for right twist barrels in the northern hemisphere, is each bullet fired tends to want to tighten the right threaded barrel tennons in their actions. I'd guess that's why the standard rifling direction in all factory barrels in North America is right twist.</p><p></p><p>To offset rightward Coriolis drift in the Northern hemisphere, we'd be better off with left twist barrels, and leftward bullet spin drift, IMO.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2666626, member: 4191"] An old thread with lots of moss on it now. But still a pertinent thread. I live and shoot at 62 degrees N Latitude. I've since learned the cause of my rightward shifts in POI. Coriolis drift caused ~3 - 4" of my left to right drift at 1000yds. Spin drift caused an additional ~6" rightward drift. Back when I started this thread, most members were unaware of those two causes of rightward bullet drift. Some may still deny those causes exist today. I regularly see both causes in play. At my northern latitude, Coriolis drift is more significant than in western States. Rightward spin drift? That's present everywhere, from barrels with right twist rifling. The only reason I can think of for right twist barrels in the northern hemisphere, is each bullet fired tends to want to tighten the right threaded barrel tennons in their actions. I'd guess that's why the standard rifling direction in all factory barrels in North America is right twist. To offset rightward Coriolis drift in the Northern hemisphere, we'd be better off with left twist barrels, and leftward bullet spin drift, IMO. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
Left @ 300 yds - Right @ 1000 yds? WTH?
Top