scope crosshair adjustment, out of room

Discussion in 'Long Gun Accessories and Optics' started by TexasPatriot.308, Sep 27, 2016.

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  1. TexasPatriot.308

    TexasPatriot.308 Member

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    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?
     
  2. 243winxb

    243winxb Member

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  3. TexasPatriot.308

    TexasPatriot.308 Member

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    this is a Ruger No. 1, so do you shim the rings themselves?
     
  4. 243winxb

    243winxb Member

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    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.
     
    Last edited: Sep 27, 2016
  5. TexasPatriot.308

    TexasPatriot.308 Member

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    thanks, I'll try it.
     
  6. Nature Boy
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    Nature Boy Contributing Member

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    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
     
  7. FastCut

    FastCut Member

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    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/shim-stock/machining-supplies/machining/ecatalog/N-9oeZ1z0ng3c?perPage=48&requestedPage=1
     
  8. MEHavey

    MEHavey Member

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

    LeonCarr Member

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    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
     
  10. Bart B.

    Bart B. Member

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    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.
     
  11. Walkalong

    Walkalong Moderator Staff Member

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    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.
     
  12. Kendal Black

    Kendal Black Member

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    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!
     
  13. Barrelgal

    Barrelgal Member

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    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
     
  14. Bart B.

    Bart B. Member

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    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.
     
  15. 243winxb

    243winxb Member

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    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. :D
     
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