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Precision Scope Mounting For The Working Rifle

By Jim See of Elite Accuracy - - Everybody seems to be an expert when it comes to putting stuff together but a novice when it comes to diagnosing...
By ADMIN · Jan 31, 2019 ·
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  1. ADMIN

    ADMIN Administrator

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    ADMIN submitted a new Article:

    Precision Scope Mounting For The Working Rifle



    Read more about this article here...
     
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  2. ShtrRdy

    ShtrRdy Well-Known Member

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    Thanks for taking the time to write this up Jim! Much appreciated.
     
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  3. johnnyk

    johnnyk Well-Known Member

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    Wow, good info. Never thought about bedding rings like that before but makes a ton of sense and adds to the total precision package. Thanks a bunch Jim.
     
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  4. DMP25-06

    DMP25-06 Well-Known Member

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    After reading this article , I presume that this epoxy bedding would prevent my scope from moving slightly forward from recoil of a .340 Weatherby Magnum .
    My rifle would shoot the first 2 shots into same hole at 200 yards and then the group would begin opening up more on each following shot . I was baffled , checking base first , then rings for proper torque , mounting another scope , re-zeroing , and then getting the exact same results . I checked stock bedding , barrel free-float clearance , and weighing all reloading components exactly . Still the same results .
    Then I got the idea of checking for scope slippage in the rings . Using a pencil , I marked the scope tube at front and rear of each ring to check for movement . After firing 6 - 8 shots , and watching the shot grouping open , I looked at my marks on the scope tube and found that the scope had moved .050" or slightly more forward from it's original location .
    Weatherby Mark V action , Near Mfg. one piece 25 MOA rail , Leupold Mark IV rings , and Leupold Mark IV 4.5 - 14 x 40 LRT , 30mm tube scope with weight at 19 oz. , if I am correct in remembering Leupold specs . Douglas Premium XX barrel with Holland muzzle brake . Overall weight of rifle/scope combo is 10 pounds . 250 gr. bullet @ 3020 FPS ( Magnetospeed ).
    Would this slight amount of movement change the point of impact noticeably ?
     
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  5. LanceK

    LanceK Well-Known Member

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    So how much space do you need between the rings and scope? Are the rings opened up to allow room for the epoxy?
     
  6. Jim See

    Jim See Well-Known Member

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    You attach the scope ring bottoms to the rail and torque to spec, then dry fit the scope into the rings. If the scope falls in place with no binding and slides back and forth in the rings with light pressure you have enough clearance. If the scope binds or sticks to the rings then I would Lap some clearance into the ring bottoms before bedding.
     
  7. Jim See

    Jim See Well-Known Member

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    Yes bedding those rings would make a difference in scope slipping.
     
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  8. shortgrass

    shortgrass Well-Known Member

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    Great attention is paid to 'stress free' bedding of action to stock. 'Bout time as much attention was paid to mounting optics!
     
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  9. LanceK

    LanceK Well-Known Member

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    So the layer of epoxy must be really thin. I have a lot to learn about doing things the right way! I guess I have been lucky that I have not had issues with scopes moving before.
     
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  10. GunForumReader

    GunForumReader New Member

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    Thank you for the excellent article.
     
  11. gillettehunter

    gillettehunter Well-Known Member

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    Very interesting. Never thought about bedding the scope, but it makes a lot of sense. What is your preferred "spray release agent"?
    Bruce
     
  12. mobenzowner

    mobenzowner Well-Known Member

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    Good Info...………………..
     
  13. Jim See

    Jim See Well-Known Member

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    I use a product called "Mold Shield"
     
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  14. Patton63

    Patton63 Well-Known Member

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    Very informative. Thanks for taking the time to write this up.