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Question Advice needed please

Discussion in 'Anything Airgun Related' started by Dusty605, Feb 26, 2014.

  1. Dusty605

    Dusty605 Active Member

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    Hi, I've recently bought a bsa lightning to get into airgunning. The rifle came with a cheap scope which was ok but I bought a new one which is better. Having fitted the new scope I have found that at 30 yards I have run out of elevation and I'm still about 2 inches low. Having spoken to the shop I bought the scope from he suggested I wind the turret right down and shoot at 15 ft and move the turret a turn at a time to see if the pellet comes up each time, which it did. However at no point did it land above my aiming point, at its highest elevation it was still about 1/2 inch below at 15ft. I would have expected it to have gone above at some point or am I wrong as I am so close. The man at the shop did suggest that the barrel may have drooped a little with it being a break barrel. Any thoughts would be greatly appreciated, thanks.
     
  2. Hodg

    Hodg Donator

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    Was it ok with the other scope on?
    Atb Terry
     
  3. mark112

    mark112 Engaging Member

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    Sounds like you need to shim the rear of the scope. Do a search for it on this forum for info. Quite common. Or try mounts other way round.
     
    Last edited: Feb 26, 2014
  4. Dusty605

    Dusty605 Active Member

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    Hi, thanks for the quick replies, yes it seemed ok with the original scope on it, although the pellets were rubbish. If anything I was shooting slightly high with the original scope and I still had a good 2 or so turns on the turret to play with.
     
  5. bhodge

    bhodge Posting Addict

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    In that case shimming the rear mount should do the trick...
    Good luck.
     
  6. Dusty605

    Dusty605 Active Member

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    Shimming it is then thanks, I will keep you posted
     
  7. bobbie1

    bobbie1 Busy Member

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    sounds like it could well have barrel droop ,
    I don't like shimming scope's it can cause dammage to the tube ,
    you can buy a adjustable mount from Nikko for around 20 quid , like this it has , up and down only ,
     

    Attached Files:

    Last edited: Feb 26, 2014
  8. Beachcomber

    Beachcomber Donator

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    If it's shooting low, wouldn't you need to shim the front mount, not the rear?
     
  9. Dusty605

    Dusty605 Active Member

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    Just out of interest, am I shimming because the barrel has possibly drooped or just because that's how it is sometimes
     
  10. bobbie1

    bobbie1 Busy Member

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    if you shim the front it will shoot even lower ,
     
  11. r10hunter

    r10hunter Honorary Member

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    That would make it shoot lower.

    You have to think of it like " make the scope point to the spot where the bullet hits"
    All of my airgun scopes are shimmed it's not a problem unless you go crazy with the Allen key.
    Cheers Andy
     
  12. bobbie1

    bobbie1 Busy Member

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    could be either ?
     
  13. r10hunter

    r10hunter Honorary Member

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    With an airgun you a zeroing at a very short range so the scope sometimes does not have the travel and needs tilting down a little. Mostly scopes are designed to fit on powder burners.
    I have a £500 scope that needs to be shimmed. Many scopes still need shimming when fitted to top end pcp's . Don't worry about it enjoy your gun and scope.
    Cheers Andy
     
    Last edited: Feb 26, 2014
  14. edtwozeronine

    edtwozeronine Donator

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    If it's break barrel, it could well be barrel droop. Even my fairly new Hatsan S60 had it. Shimming the rear mount made a real difference to zeroing the scope.
     
  15. Dusty605

    Dusty605 Active Member

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    Ok thanks, the only thing I had to hand was a plastic milk carton so I've cut a bit of that to size, hopefully that will work
     
  16. bhodge

    bhodge Posting Addict

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    That will certainly make a difference, treat it as an experiment in the first instance...if it shoots too high then try something thinner.
     
  17. Beachcomber

    Beachcomber Donator

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    Yes - I was thinking of lowering sights to point to where you were shooting rather than the opposite.
     
  18. mark112

    mark112 Engaging Member

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    Hi

    Telescopic sights work optically at their best when the turrets are set in the middle of their adjustment range. You can then use a shim calculator to calculate the thickness of shim to help achieve this. Chairgun has a scope shim calculator in the 'Toolbox' section.

    e.g Assuming your scopes adjustment turret is in the middle of it's range (if you have 6 complete turns of movement then move it 3 turns from fully down) If your shots are 6" low at 25 yards and your mounts are 4" apart then you will nedd to put 0.027" (27 thou) of shim under the rear mount. I prefer something metalic as it will not give over time. In fact thinking about it an old set of feeler gauges cut up would do and give exact shim size required (Amazon have them for a couple of quid a set). Others people have used old 35mm film/coke cans/PCB solder paste stencil etc as shim.

    Any further adjustment is done with turrets now you are somewhere near. Hope this is of some use.

    Mark
     
  19. Dusty605

    Dusty605 Active Member

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    I like the idea of using feeler gauges as shims, makes sense to me. I will see where I am with my current shim and if I'm still nowhere near then I shall check out the calculator, thanks.
     
  20. Dusty605

    Dusty605 Active Member

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    Hi, update so far. I'll keep it short. I went out to zero at 10 yds with my now shimmed scope and after some adjusting and moving backwards and forwards I've managed to get it spot on. I phoned up the shop to give them an update of what I've done and asked about final zero distance as I want to shoot quarry and hft. He suggested 25 yds as my 22 probably wouldn't be much good beyond that as it would lose power after about 18 yds. What are your thoughts on this. I have to say I came off the phone a little disheartened and feeling that I should have got a 1.77.
     

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