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Shimming A Scope - Help!

Discussion in 'Technical' started by pjgtech, Mar 4, 2019.

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  1. pjgtech

    pjgtech Sleep, eat, work, eat, chillout, sleep, repeat.

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    Although I managed to zero my new R10 earlier today, it was shooting really high and I could only just about adjust the scope enough to get the ret on the POI.

    I checked that it was basically central before zeroing, by winding the turret one way fully then turning the other way fully and counting how many turns, then counting back to the middle, eg: six turns end to end, so three turns back are roughly central, etc.

    I had to wind the turret a good two turns from its centre to get it near zero. Now I don't like having a scope near its max limit, so I am thinking of adding a shim, but....
    I must be having a senior moment or summit as I'm going cross eyed trying to work out if I need to shim the front or rear?

    The pellet was going really high, and I pretty much maxed the scope upwards to bring the ret onto the POI.
    So I want to wind the scope back down, so its nearer its central position, so I want to raise the front of the scope, is that right?

    The more I think about it, the more I'm confusing myself!!! :facepalm:

    And yes, I did check, and double check, that the scope is mounted ok, sitting ok on the guides, even gaps when tightening up the mounts, etc.

    Course it could also be a dodgy scope (its new), lets see...
     
  2. Super-20

    Super-20 Posting Addict

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  3. Tadpole

    Tadpole Super Moderator Staff Member Mod/Admin

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    The search button is worth a try .. ;)

    Maybe this one
     
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  4. That hurts

    That hurts Barely Active

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    Also worth swapping the mounts round first as shimming isn't always ideal :up:
     
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  5. pjgtech

    pjgtech Sleep, eat, work, eat, chillout, sleep, repeat.

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    Cheers chaps, useful thanx... Raise the front, as I thought, just the more I thought about it the more I began to doubt myself! :)
     
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  6. pjgtech

    pjgtech Sleep, eat, work, eat, chillout, sleep, repeat.

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    Yep, will try that as well, ta..... :thumb:
     
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  7. Jay Butts

    Jay Butts Life, it’s so much better than the alternative!

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    Daystate actually recommend film negatives cut down. Never needed to do it myself though.
     
  8. Scrinja

    Scrinja EGO dont facere fatuis

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    Treat yourself to some adjustable mounts :cool:
     
  9. pjgtech

    pjgtech Sleep, eat, work, eat, chillout, sleep, repeat.

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    Now sorted..... :thumb:
    Not at work today, had really bad guts this morning, but found an hour when I was not on the loo..... :facepalm:
    Took scope off, mechanically re-centred the scope, swapped mounts round on the gun, re-fixed scope, was nearly there, only needed minor adjustment to re-zero.
    So did not need shims.
    Thanx guys. ;)

    ... Yes, I washed my hands! :D
     
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  10. Patrick

    Patrick Donator

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    I'm not a fan of shimming myself and adjustable mounts are far better but expensive of course. you could buy a droop compensation mount and use it the reverse way,they are a bit cheaper. Film negative is a popular choice for a shimming material but if you go on the BSA website,not the BSA owners club website and look under 'optics' there's an article on there showing how to shim a scope/mount using kitchen foil. You fold it in such a way that it prevents marking or lessening the risk of marking the scope body and seating the scope better. If the gun is shooting high then yes you will have to shim the bottom of the front mount not the rear mount as is the case when a gun is shooting low.
     
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  11. That hurts

    That hurts Barely Active

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    Good stuff and often forgotten .... have seen some right shimming horrors with more than just a 'crimp' to the scope tube as a result :facepalm:
     

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