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Weaver V12B runs out of adjustment

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/24/2007 at 14:09
ba_50 View Drop Down
Optics Apprentice
Optics Apprentice


Joined: December/02/2004
Location: Illinois
Status: Offline
Points: 150

Hi,

 

My old V12-B (4-12x)has been overhauled once and the dials worked on some time ago. I did a box test with it on a CZ 452 .22 rilfe and it came within 1 1/2" of starting point.

 

I remounted it using  Weaver low rings on a Marlin 336 carbine. Using 150 grain bullets, it shot 6 inches low and wouldn't go up without the dial topping out or close too it. Last year it worked ok using medium  Weaver rings.

 

I read an article saying that scopes need to be re-centered by bottoming out, counting all the way up, then going to the half way mark. I can't see what this proves because one till has to sight in for a particular distance. On this scope the elevation dial stops clicking when it gets above the little post on the side of the dial.

 

I could put it back on a different rifle but thought I would ask about it here first. Since this is an old scope I hate to put more money into it even though it is a collectors item.

 

I tried switching ring positions and this time it was two feet low. I guess new rings are in order. The rifle put 4 shots into 1 1/4 @ 100 yards with one load. 1 flyer.

 

 



Edited by ba_50
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2007 at 03:50
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
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Lord Of The Flies

Joined: March/14/2007
Location: South Africa
Status: Offline
Points: 5751

The idea is to centre your scope settings and then to mount it. Using means other then the dial of the scopes you have to get it near centre. Set the rifle in a rest, look through the barrel at a small object 5-10 yds away. Then, without using the dials get the scope centered on the same object. This can be acheived by rings that have windage screws, shims etc.

 

I have a similiar problem on mounts I am using now. I had to place a 2mm shim under the rear mount to get it to zero.



Edited by 8shots
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2007 at 09:28
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Optics Master
Optics Master


Joined: October/05/2006
Location: North Carolina
Status: Offline
Points: 1795
Technically, when mounting a brand new scope, you should zero that scope, meaning, make sure you are at the true zero points for the E/W.  This can be done by simply placing the scope in a v-shape mount, ie cardboard box with two v-shaped cut outs and rotating the scope to see if it maintains the center points.  This is basically what the article you read is telling you to do.  To get back to the zero point of your scope so that you have ample adjustment for you E/W when sighting your scope to a specific distance.  Now, if your dials are malfunctioning, there is no cure for that, to include shims or otherwise.  But, given your box test, they seemed reasonable accurate, but with different height rings.  I personally do not like shims, too vulnerable to movement, especially with higher caliber rifles and it is too easy to solve the problem with a different set-up.  Burris makes rings with varying degrees of offset built into the rings to account for these types of problems, but they are made of some type of plastic and you know what happens to that type of material over the years.  Try what the article you read said and see what happens.
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