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How to re-zero a scope??

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/20/2008 at 23:04
cidme View Drop Down
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Is this possible?  I got an old scope from someone and it seems a little out of wack.  I though I read something about using a mirror, is this possible or am I going crazy?
Thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/21/2008 at 02:54
8shots View Drop Down
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Not sure what you mean that it is "out of wack". Just wack it back with a hammer!
The mirror trick is used to make sure that your scope is aligned with the bore of the rifle. In extreme bad mounting issues the scope can be pointing left or right of the bore. It is still pssible to zero such a scope but the adjustments will be at the extreme limits. By placing a mirror in front of the scope and looking through the scope only one reticule image must be visible. If two are visible then the scope is out of alignment and is corrected by adjusting the mounts.
So it cannot be used to fix a wacked scope, whatever that problem is.


Edited by 8shots - November/21/2008 at 02:55
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/21/2008 at 06:42
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Originally posted by 8shots 8shots wrote:

The mirror trick is used to make sure that your scope is aligned with the bore of the rifle.
 
Not so.  The mirror trick is used to center the reticle within it's adjustment range and will not align the scope with the bore of the rifle.
 
Originally posted by 8shots 8shots wrote:

In extreme bad mounting issues the scope can be pointing left or right of the bore.
 
Yes alignment between scope and bore is a mounting issue.
 
Originally posted by 8shots 8shots wrote:

By placing a mirror in front of the scope and looking through the scope only one reticule image must be visible. If two are visible then the scope is out of alignment and is corrected by adjusting the mounts.
 
Not so, if 2 reticles are visible then you adjust the scope by adjusting the turrets.  Another way is to turn the turret all the way to one side, count clicks going to the other side, divided by 2 and count clicks back to the middle.
 
You still have not aligned your scope with the bore or leveled your crosshairs when your rifle is uncanted.  But that is another story.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/21/2008 at 09:01
cidme View Drop Down
Optics GrassHopper
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Sakomato,

I'm not trying to align it with the bore.  I just want to reset the recticles to zero. And for some reason when I have the turrets on zero the recticles dont line up.

Is there a trick to using the mirror? I seems like if you dont hold it just right you can vary how much misalignment there seems to be.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/21/2008 at 10:08
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Originally posted by cidme cidme wrote:

Sakomato,

I'm not trying to align it with the bore.  I just want to reset the recticles to zero. And for some reason when I have the turrets on zero the recticles dont line up.

 
What type of scope do you have, friend?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/21/2008 at 13:39
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Its a marlin model 800 1.5-5, It at least 30yrs old it was my dads.  Its going on a 22 for squirrel hunting.  The optics are still clear and it has nice eye relief. Plus it has a nice recticle pattern.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/21/2008 at 14:51
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A couple of comments.

First of all, the mirror trick does not necessarily align the scope with the centre of its adjustment range.  It aligns the reticle with the optical axis.  Mechanical center should coincide with the optical axis, but it is usually a little off.

Now, onto the zero markings.  Usually, there is a way to lift off a knob (it is typically held in place by a couple of screws) and place it back down so that the zero marking matches the zero of the rifle.  However, if this is an older scope, that may not be an option.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/24/2008 at 04:31
8shots View Drop Down
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The scope should be about optically centered when the turrets are at the mid points but that is not allways the case. To check the optical center you need to mount the scope in some v blocks Use an old shoebox, but I have found it to flimsy, with a couple of v's cut in the sides. Lay the scope in the blocks and set it up so that you have some sort of aiming point for the cross hairs. Rotate the scope through 360 degrees. The cross should make a oval / circle around the aming mark. Adjust the turrets untill the circle is as small as possible the scope will now be truly optically centered.



Edited by 8shots - November/24/2008 at 04:33
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