scope crosshair adjustment, out of room

TexasPatriot.308 · Sep 27, 2016

I got a Weaver Grand Slam I had on a previous rifle, I put it on a new rifle and while trying to sight in I have run out of adjustment on the elevation. this is a 4.5 x 10 x 50, like I said I can no longer turn knob for adjustment....any help other than calling Weaver?

243winxb · Sep 27, 2016

Shim the scope base , if possible. http://bushnell.com/getmedia/43d8a20f-02b6-481d-b6b0-d4679f89b14a/shim_guide_2.pdf?ext=.pdf

TexasPatriot.308 · Sep 27, 2016

this is a Ruger No. 1, so do you shim the rings themselves?

243winxb · Sep 27, 2016

Shop Ruger http://shopruger.com/searchscopering.asp Look at the "scope ring chart" for the correct ring. Theres a link to it. Or cut some soda can shims , put under the scope, in the rings. Cans are about .004" thick. Use as many as needed.

TexasPatriot.308 · Sep 27, 2016

thanks, I'll try it.

Nature Boy · Sep 28, 2016

Does the Ruger #1 use proprietary rings like their M77 rifles?

If not, try a set of Burris signature Zee rings and a set of their inserts. I used them on a rifle of mine that had the same problem. Worked great

FastCut · Sep 29, 2016

http://www.burrisoptics.com/mounting-systems/mounts-and-bases/ruger-to-weaver-base-adaptor

You can use the above adaptor or several other types to adapt to other rings. That said the soda can trick is super cheap and easy. I had done this on a ruger 77 once but could only fit one thickness before I had trouble seating the rings tight to receiver. Cans are so thin these days you might be able to get 2 layers if required. If you want something nicer you can purchase it from Grainger or MSC direct and cut to fit.

https://www.grainger.com/category/s...alog/N-9oeZ1z0ng3c?perPage=48&requestedPage=1

MEHavey · Sep 29, 2016

Before you do anything else, swap the current rings front-to-back.
Then see....

LeonCarr · Sep 29, 2016

If the scope was on a previous rifle, have you centered the reticle in the scope tube (turned the elevation knob completely to the left, count the total number of clicks from left to completely to the right, go back left half the number of clicks), and done that also with the windage?

I would do that before spending more money on rings or cutting up soda cans.

Just my .02,
LeonCarr

Bart B. · Sep 29, 2016

Centering the scope's adjustments in the middle of their adjustments have never centered the scope's moving tube with the reticule on any of the scope's mechanical axis for ones I've checked. They all have had a greater range of movement from dead center to the adjustment knob; more up and right than down and left with windage adjustment on the right side.

Center the scope's internal tube by resting it in two V blocks well anchored, then rotate the scope while making adjustments until the reticule stays at one place while twisting the scope. Look into the objective lens after doing this and the inner tube will be well centered in the outer tube.

Walkalong · Sep 29, 2016

I haven't heard that before Bart. Sure makes a lot of sense. If I ever need to do this, that is how I will go about it.

Kendal Black · Sep 29, 2016

I agree, Bart B. has given us a useful new insight about centering the reticle. The business of running the adjustments all the way over and all the way back gives you the center of mechanical adjustment, which may not correspond with the optical center of the system. Interesting point!

Barrelgal · Sep 30, 2016

In all my years of mounting scopes I can't believe no one has ever mentioned Barts reticle centering trick, about as straight forward and simplistic as it gets.

Thanks Bart

BG

Bart B. · Sep 30, 2016

Thanks for your support in this venue. I think it's probably the most misunderstood mechanical alignment thing in rifle aiming and shooting.

Next two items on my "most misunderstood mechanical alignment" list are, when the round's fired, is where the case positions itself in the chamber and where the bore axis points relative to the point of aim.

243winxb · Sep 30, 2016

Scope mounting

The V block info has been in the bushnell scope mounting instructions for years. But as we all know, no one reads instructions on how to mount a scope.

CENTERING THE RETICLE
The reticle was carefully set at the optical center of your riflescope at our factory. This
setting provides you with the ideal adjustment range from the center position. The
r i f l e s c o p e ’s adjustments are used to zero-in the riflescope.
It is wise to check the center of the optical axis before mounting. Do this by placing
the scope in a solid V-block (card b o a rd box with two slots). While looking thro u g h
the scope in a normal viewing position, carefully rotate the scope. If the target
moves in a circle larger than 1” from center (at 25 yards) in relation to intersection
of crosshairs, reset windage and elevation adjustments. Remove adjustment caps.
Set each adjustment to midpoint and recheck for centering. If target still rotates, use
adjustments to correct.

scope crosshair adjustment, out of room

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