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To Shim Scope Or Not

Discussion in 'Technical' started by DRAGONBAIT666, Jul 2, 2018.

  1. DRAGONBAIT666

    DRAGONBAIT666 Posting Addict

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    just bought new Nikko Sterling 6-18x44 ao ir

    Long story short. Shooting super high

    Checked obvious things

    Changed mounts about etc

    But even though it now kinda zero’d the best i can get is 2 half mil hold under at 30 yards and thats with turret turned to max setting

    So do i contact shop n see what they say or just shim the front mount?

    Any advice be v welcome
     
  2. terry1001

    terry1001 Major Poster

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    Did you have another scope on that rifle previously and if so did that have a similar problem?
    Every scope should have its optics aligned with the tube so, in theory, any scope you put on should have a similar amount of adjustment for a zero at the same range. It's not good practice to have the turrets maxed out, much better to be in the central part of the adjustment as the adjustments tend to be more accurate and consistent there.
    It's not common to be shooting high, generally people can't get enough elevation which is sometimes down to barrel droop etc.
    I would first try another scope - if you can get hold of one. If a second scope has no problem then I would contact the shop and ask them to investigate as you may well have a faulty scope. I'm not a fan of shimming except perhaps for a tiny amount as it can strain the scope tube and in the worst case cause damage as the bore through the mounts would no longer be in line and tightening the screws would try and bend the tube. Once you have actually shimmed it you might find that the shop doesn't want to know about any faults when you tell them what you've tried.
     
    DRAGONBAIT666 likes this.
  3. robs5230

    robs5230 Oversprung

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    I'd go back to basics first and manually centre the turrets then try a zero at a short range say 10 yards.
    If there's a silencer fitted, remove that also and try without just to rule out clipping
    Failing that, if you have already swapped the mounts over, I'd return the scope. No reason to be shimming.
     
    DRAGONBAIT666 likes this.
  4. DRAGONBAIT666

    DRAGONBAIT666 Posting Addict

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    Big thanks for the replies

    Gun is HW77k

    Bought new couple weeks back with Nikko Sterling 4-12x50 ao scope

    Gun n scope worked together v accurate

    Bought this more powerful scope n sold other one

    This scope has the prob i mentioned

    I started from beginning

    Scope n mounts totally seperated n put on with care etc

    No mod

    Swapped mounts around

    I not knocked or dropped Gun nor scope

    No loose bolts or stock

    So think i done all i can to ensure it not my mistake or obvious fault beyond a dodgy scope

    Guess i need contact shop then
     
    robs5230 likes this.
  5. robs5230

    robs5230 Oversprung

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    Just one daft question... does the rear mount have a recoil arrestor pin ? Is it screw in or knock in type ? If it has one did you fit the mount with the pin protruding ? Or did you fit the mount and tap / screw the pin down into an arrestor hole?

    If it has a pin, tap/ screw it back up , refit the mount and the tap / screw the pin down and try again.
     
    Sky likes this.
  6. bigal

    bigal Jedi.

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    Another quick test to see wots straight etc. Turn the scope 90% up turn to left mode, should show if it's the gun or the scope out.
    Scope out u see the left/right adjustment bottoms out. Using the up/down turret etc. ;) Al
     
    DRAGONBAIT666 likes this.
  7. DRAGONBAIT666

    DRAGONBAIT666 Posting Addict

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    Yup checked arrestor pin. Wasn’t an issue as was not screwed down.
     
  8. DRAGONBAIT666

    DRAGONBAIT666 Posting Addict

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    Good idea. Will try that tomoz

     
  9. bigal

    bigal Jedi.

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    I had fun as a lad with a hw77k. Scope never lined up. L/r.
    Miles out. And a good look at it.
    In the factory someone moved it out it clamp as it was welded up. Tube to barrel, blob of weld each side,
    I passed it on, had a hw 80, :) al
     
    DRAGONBAIT666 likes this.
  10. DRAGONBAIT666

    DRAGONBAIT666 Posting Addict

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    For now i have shimmed the scope
     
  11. Artfull-Bodger

    Artfull-Bodger Posting Addict

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  12. phil.m

    phil.m Donator

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    I've never shimmed a scope, tbh I've not been into airgunning long & I'm still learning.

    When you do have to shim, do you put them inside the bottom half of the scope ring, or underneath the mount (between the block & the mount)?
     
  13. Patrick

    Patrick Donator

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    Scopes do very sometimes depending on make an model on the amount of adjustment they offer but ig you decide to keep the scope then i personally would avoid shimming and buy some adjustable mounts or mount.Or you could use a droop compensation the other way round i.e reversed.
    Ant-supplies do an adjustable mount for £20
     
  14. PBaz Barrett

    PBaz Barrett 'I love slinging lead me'..

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  15. DRAGONBAIT666

    DRAGONBAIT666 Posting Addict

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    I shimmed with some photo negative in the front mount under the scope


     
    CarlStar67 and phil.m like this.
  16. CarlStar67

    CarlStar67 Member

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    Did the same today, although for the reverse problem! After swapping scopes on my 2 guns as part of my upgrade plan, shimmed the rear mount with 2 layers of 35mm negative to correct getting to the end of my elevation turret on the Nikko Stirling Targetmaster on my HW100. Zeros fine at 30 yards, but I like to zero at 40 and shoot from 40 (min) out to some really tough targets at just under 80 yards (max), and my preference is to dial-in the drop rather than hold over. On the range this weekend and all should be well again. Just tried it over short range in the back yard and the adjustment has clearly added the extra I was looking for, judging by the vertical offset of the PoI from when I set it up last week.
     
    DRAGONBAIT666 likes this.
  17. pbrown

    pbrown Honorary Member

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    What make and model of mounts are they?
     
  18. CarlStar67

    CarlStar67 Member

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    Just a pair of 2-piece Nikko Stirling medium rise ones with the twin hex bolts, £10 off e-bay when bought to switch the scopes on my 2 rifles. THe 110 has a Picatinny rail so had to buy some dovetail ones to make the switch. One scope has a 30mm tube, the other has a 1"... One gun has a Picattiny rail, the other has dovetails. As you'll have guessed, there's now 2 pairs of unused mounts in a draw at home!
     
  19. pbrown

    pbrown Honorary Member

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    I would suggest upping your mount budget by another £10-£20 and considering Sportsmatch or BKL mounts which are of a far superior quality. Not saying they'll fix your problem, but you can at least rule out a mount problem with both of those brands. :up:
     
    CarlStar67 likes this.
  20. CarlStar67

    CarlStar67 Member

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    It won't matter Phil, It's zeroed a treat now with ample adjustment and this is the combo I'll be selling to make way for the Woverine R, and that'll be sporting an MTC 5-30x50 Viper Pro Tactical using the mounts that originally mounted my current 3-18x50 Viper Pro Tactical on my HW100 when first bought. Those mounts were tip top with the MTC scope. Having dialled both scopes through the limit of their adjustable range and used them on both guns the issue here is more about the MTC having a wider adjustable bandwidth than the Nikko. One was £120, the other was £330 - so I can see where some of that dosh went!
     

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