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
Is a scope level needed?
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="JRu" data-source="post: 1016997" data-attributes="member: 6837"><p>Exactly. People are mixing two issues which creates confusion. Canting the scope when shooting creates the angular error, which is significant. Not having the scope vertical centerline axis intersect the bore is just linear offset and the error will be a multiple of the sight-in distance.</p><p></p><p><a href="http://s299.photobucket.com/user/ruistola/media/ScopeSetup.jpg.html" target="_blank"><img src="http://i299.photobucket.com/albums/mm294/ruistola/ScopeSetup.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>With regular (non offset) scope mounts you can only end up with situation B when mounting the scope (within tolerances of action and mount of course, but let's consider that insignificant for the purpose of this exercise). But by canting the rifle to level the crosshair when shooting, you convert situation B into situation C, and your bore offset induces only a linear error, not angular.</p><p></p><p><a href="http://s299.photobucket.com/user/ruistola/media/ScopeSetup2.jpg.html" target="_blank"><img src="http://i299.photobucket.com/albums/mm294/ruistola/ScopeSetup2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>As seen from above, when the crosshair is level, but bore is offset. The erector tube points at the sight-in point and any offset is a multiple of that sight-in distance.</p><p></p><p>You need to have the crosshair level WHEN SHOOTING. Everybody agrees on that. But the bore offset? Well it has to be pretty severe to produce measurable results. I can definitely eyeball the offset to less than .1" when mounting the scope. I zero at 165 yards (150 meters). That means at most 1" at 1815 yards, IF the crosshair is level when firing the rifle.</p></blockquote><p></p>
[QUOTE="JRu, post: 1016997, member: 6837"] Exactly. People are mixing two issues which creates confusion. Canting the scope when shooting creates the angular error, which is significant. Not having the scope vertical centerline axis intersect the bore is just linear offset and the error will be a multiple of the sight-in distance. [URL=http://s299.photobucket.com/user/ruistola/media/ScopeSetup.jpg.html][IMG]http://i299.photobucket.com/albums/mm294/ruistola/ScopeSetup.jpg[/IMG][/URL] With regular (non offset) scope mounts you can only end up with situation B when mounting the scope (within tolerances of action and mount of course, but let‘s consider that insignificant for the purpose of this exercise). But by canting the rifle to level the crosshair when shooting, you convert situation B into situation C, and your bore offset induces only a linear error, not angular. [URL=http://s299.photobucket.com/user/ruistola/media/ScopeSetup2.jpg.html][IMG]http://i299.photobucket.com/albums/mm294/ruistola/ScopeSetup2.jpg[/IMG][/URL] As seen from above, when the crosshair is level, but bore is offset. The erector tube points at the sight-in point and any offset is a multiple of that sight-in distance. You need to have the crosshair level WHEN SHOOTING. Everybody agrees on that. But the bore offset? Well it has to be pretty severe to produce measurable results. I can definitely eyeball the offset to less than .1" when mounting the scope. I zero at 165 yards (150 meters). That means at most 1" at 1815 yards, IF the crosshair is level when firing the rifle. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
Is a scope level needed?
Top