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Scopes Have I Been Sold A Pig In A Poke?

Discussion in 'Anything Airgun Related' started by Hampshire Tog, Jun 24, 2018.

  1. Hampshire Tog

    Hampshire Tog Donator

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    Fancied putting a side focus scope on to my TX200. Was at the RFD and had a mooch around for what they had. I have Hawke and Optisan scopes and would have gone for either of those. ! wanted something up to 16 x 50mm. They offered a Nikko Stirling Diamond 4-16 x 50 which while dearer than I was hoping to spend, I ended up buying because the shop had done me some deals in the past and I trusted their recommendation. Nikko Stirling is also a brand I hear mentioned on this forum a lot, usually in positive terms. The scope is nice and bright with an uncomplicated reticle.

    Given the width of the scope, (56 mm at the fat end) I mounted it in some Nikko Stirling High mounts and I set about zeroing at 30 yards. I just about got there but on the last click of the vertical turret. There is no more 'UP' I can go. Looking at the scope in more detail, I note it is an LR scope which I imagine means Long range? The parallax wheel goes to from 10 to 500 yards which is optimistic for a sub 12 ft/lb air rifle.

    1.) Was it right for the RFD to have recommended this scope? 2.) What should I do now? Does anyone have experience of successful scope shimming? I gather fractions of a millimetre e.g. the width of a couple of pieces of tape can make all the difference. Would some adjustable scope mounts make a difference?

    Thanks as ever for your wisdom.
     
  2. milek

    milek Honorary Member

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    What type of shooting do you do, with that we can tell if their recommendation was right? It should be ok for most situations . Swap the mounts round first and see what gives.
     
  3. Regal Man

    Regal Man Very Active

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    Id take the scope back to the shop, and say its not fit for purpose. Something not right there.
    No way should the turrets, need to be as high as they can go. And maybe more.
    Could be the scope got damaged in shipping.
    Unless its used at range it may not show. But you have found a fault.
     
  4. StellaArtois Sr

    StellaArtois Sr Springer Whore

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    It has happened to me a few times and I have had no problems shimming the scope. I usually use a film base as it doesn't need much to adjust, and certainly don't over tighten the bolts as you run the risk of putting crimp marks on the scope.
    Just remember that you will need to shim the rear mounts.
     
    foxtrott likes this.
  5. shauny

    shauny Top Poster

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    as said lift the back to give you ,more elevation.(unless you have sunstroke):thumb:
     
    The Robin and milek like this.
  6. Hampshire Tog

    Hampshire Tog Donator

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    I shoot targets out to a max. of 80 yards.

    Thanks for the tip re: swapping mounts. Unfortunately, I can't swap the mounts because the rear mount has the arrestor pin.
     
  7. Hampshire Tog

    Hampshire Tog Donator

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    Thanks for this. When you say a 'film base' what do you mean? I've read old 35 mm celluloid film can be used but who uses that anymore? Can one use strips of insulating tape?
     
  8. shauny

    shauny Top Poster

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    tape or popcan strips.:up:
     
  9. larryking28

    larryking28 Busy Member

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    Used to used the negatives from 35mm film cameras once upon a time ;)
     
  10. DUNKS

    DUNKS Big Poster

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    I would not use insulating tape. You need something that wont squash out.
    35mm film really is best and there's tons of it about. Just try asking around.
     
  11. scanner

    scanner Engaging Member

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  12. FPoole

    FPoole Posting Addict

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    Aluminum soda can cut into strips works good. I think it's about .007" thick. One shim raises my point of impact by 1" at 25 m. I have used as many as 4 layers, but I cut them a bit more narrow than the ring width and make each a little narrower than the one above it. Gives me a bit of a taper on the one ring at least. Don't crank down on the ring screws really hard or you may crimp the scope tube.
     
    metalman likes this.
  13. Regal Man

    Regal Man Very Active

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    Have you got a spare, scope you could try for comparison? What you have ive had it, the scope got send off to Japan to get fixed.
    Being a Light Stream no way was i going to throw it away.
     
  14. robs5230

    robs5230 Oversprung

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    Remove the arrestor pin then check to see if things change.
    If things do change with the mounts swapped round, get some better mounts.
     
  15. subzeer0

    subzeer0 Engaging Member

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    try cutting a pepsi bottle or the like for shims...it works
     
  16. Patrick

    Patrick Donator

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    If you like the scope apart from the fact that you've run out of elevation adjustment you could shim the bottom cradle of the rear mount using either 35mm film negative or folded up aluminium kitchen foil are two of the favourite materials to use. Personally I don't like the idea of shimming scope mounts as there's a risk of damaging or marking the scope's body/tube. The alternative and much better idea is to buy a droop compensation mount made by SportsMatch or Hawke which cost about £25.
    To be honest I doubt if the RFD was unaware that you'd run out of elevation adjustment on a TX200 unless he's had someone else suffer the same experience,it's rare on fixed barrel rifles unlike break barrels. Putting the same scope on another rifle and the problem may not be encountered.Scopes themselves depending on make/model do vary in the amount of adjustment offered on the adjusters.
    If you want to shim the rear mount using kitchen foil you can go on the BSA web site,the factory site not the owners site, and under Optics click on setting up a scope and there's an article showing you how to fold the foil in a certain manner and use it so that you don't mark/damage the scope's body/tube.
     
    Last edited: Jun 25, 2018
  17. telephonepete

    telephonepete Donator

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    cut a couple of bits of plastic from a round bottle.
     
  18. larryking28

    larryking28 Busy Member

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    I shimmed the mount on a HW97 once using the 35mm negatives.
    Had some work done on it and was told the barrel was slightly bent,and that was on a supposedly new gun.
    They straightened it for me at the same time and I had to take the shims back out again.
    Might be worth checking the mounts are in the grooves properly, more than once I have put a scope on to find it wasn't sitting quite right.
     
    Hampshire Tog likes this.
  19. Hampshire Tog

    Hampshire Tog Donator

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    Thank you for that. All good tips. Who knew a few microns of material like 35mm film could make such a difference?
     
  20. Hampshire Tog

    Hampshire Tog Donator

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    Already on order! Mind you, it's a Nikko Stirling scope and I used Nikko Stirling mounts. One would have thought that if any are the right ones then it would be those.
     

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