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Advice Advice urgently needed !

Discussion in 'Anything Airgun Related' started by stevemandm, Sep 20, 2014.

  1. stevemandm

    stevemandm Honorary Member

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    hi guys, this dilemma has me stumped, so all advice greatly appreciated.
    the kit is an air arms s400 mpr ft, hawke 4-12x50 ao panorama ev, sportsmatch mounts, and all is 'as new'.
    the scope appears to be set up correctly and plumbed for vertical alignment. it is then zeroed at 30 yards, and it really is 'pellet on pellet' accuracy.
    the problem is as follows :
    aim at 10 yards, and its shooting 10mm to one side (cant remember which).
    aim at 45 yards, and its shooting 10mm to the same side.
    this is happening regardless of whether the ao ring is used to re-focus or not.
    if it were scope crossover, i would have thought it would be shooting to the opposite sides of vertical at 10 and 45 yards, having being zeroed at 30 yards.
    we have tried using different pressure on the top half of the mounts, but to no avail.

    like i said, any help or advice greatly appreciated, so get that lump of grey matter working !
     
  2. Tinbum

    Tinbum Delusions of adequacy

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    Barrel harmonics? Try removing the mod and/or float the barrel. If there's any change its time to start making weights!
     
  3. milek

    milek Honorary Member

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    Just to be safe Steve swap the mounts around a bit and then be absolutely sure about head position. If none of this works let Matty have a go; he can shoot.
     
  4. stevemandm

    stevemandm Honorary Member

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    forgot to say, with a hawke sport 4-12x50 and an mtc viper 8-32x60 scope, its spot on
     
  5. Tinbum

    Tinbum Delusions of adequacy

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    Ah! Then its the scope!:D

    I agree with Milek, head position/px is out of whack.
     
    Last edited: Sep 20, 2014
  6. Bluefrog

    Bluefrog Busy Member

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    My pano does the same Steve
     
  7. ratman60

    ratman60 Pro Poster

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    hello, very strange, good zero at 30mtrs yet closer and longer distance a 10mm off centre. i am sure someone will have a solution. good luck
     
  8. stevemandm

    stevemandm Honorary Member

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    funny ! thought about the mounts mick, have some bkl's on order mate
     
  9. ratman60

    ratman60 Pro Poster

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    hello, so how did you rectify it ??
     
  10. Bluefrog

    Bluefrog Busy Member

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    i havent

    i know where it goes and works for me
     
  11. stevemandm

    stevemandm Honorary Member

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    exactly the same mate ?
     
  12. XTX

    XTX Donator

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    Pretty sure it is cant, I know you said the scope was properly set up but it may be a smidge out and/or you cant the rifle when you shoot.
     
  13. JD

    JD Donator

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    Just a passing thought,

    but how much of a gap is there between the barrel and scope bell ?
     
  14. stevemandm

    stevemandm Honorary Member

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    At work at moment mate, but if I remember correctly , approx 10mm, I think. The bkl's will be closer
     
  15. Patrick

    Patrick Donator

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    Does it do it with all/different pellet brands or just that particular one?
     
  16. terry1001

    terry1001 Major Poster

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    I suspect the scope is at fault and that focussing is altering the position of lenses and the optical path. Are you changing magnification?
    Try setting the AO at a range somewhere in the middle and then shoot at 10, 20, 30, 40 as required without touching the AO or zoom and see if your windage stays constant. I would have thought that internal scope problems due to the AO would also cause some elevation shift but that might well be masked by the range changes.
     
  17. 177

    177 Donator

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    ^^ this ^^

    I had a Simmons do this on me a few years back - very frustrating...
     
  18. Jackroadkill

    Jackroadkill Donator

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    Whilst between real scopes for my .22lr I used a 3-9x50 Mountmaster on it and every time I adjusted the AO the windage would go all to cock. It was very frustrating to say the least, especially as I didn't realise what was going on at first and blamed my shooting. I would re-zero, get everything right, be confident of my zero and then go out in the field, adjust the AO and be unable to hit really easy shots. I only realised that the scope could be at fault when I fiddled with the AO during yet another re-zeroing session and suddenly was missing the bull by a good three inches to one side (group was still fine) at fifty yards. I swapped the scope for an old Japanese Tasco and the problem vanished.
     
  19. terry1001

    terry1001 Major Poster

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    It's surprising that more scopes don't suffer from this problem particulalry when you see how cheap they can be. It's probably caused by one of the lenses being slight misaligned when assembled such that the optical axis doesn't align perfectly with the centre line of the scope. If you could clamp it up and rotate the AO a full turn you would probably see the reticle move in a circle about the scope axis.
    This is something that comes up frequently when using (expensive) camera lenses in dedicated scopeless night vision equipment, these lense were never intended to be perfect in this respect as the concentrate more on definition and resolution in the design. Rifle sights should be optimised for maintaining zero but the more moving parts that are added the more difficult this becomes, the best performers will be the simplest such as a fixed power non-focussing version but of course that sort of thing is out of fashion.
     
  20. stevemandm

    stevemandm Honorary Member

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    just kept with the exact express, as it was perfect with them.
     

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