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a smart arse needed sort this one out

Discussion in 'Anything Airgun Related' started by rosie 1, Jan 23, 2014.

  1. rosie 1

    rosie 1 Engaging Member

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    Ok, so we have zeroed our scope @30 yards...BUT how do we know that the scope axis is in "perfect" alingnment with the "barrel axis" if you "Zero instead at 20 yards (DEAD CENTRE) and then shoot at a bull at 35 yards (dead centre) the point of impact will almost always shoot slightly to the left OR right (NO WIND)and the same being at about 15 yards???? THINK ABOUT IT?? you will be very lucky if it shoots dead centre throughout its entire range say about 15 to - 50yards... I am not talking about horizontal centre here i am talking about virticle centre..This did show up on one of si pittaways videos were he had zeroed at 27 meteres but shot to the left at close range..has anyone noticed this with there zeroeing.and if so how have you sorted it or dont you bother.My setup suffered from this but i have painstakingly solved the problem by gradually shimming the mounts and now shoots in a perfect virtical line ... any takers...
     
    Last edited: Jan 23, 2014
  2. mattyts

    mattyts Donator

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    Using good quality mounts helps, BKL mounts are machined in 1 piece so it clamps equally on both sides rather than been pulled to one side.

    If you have good quality mounts,scopes and you still suffer from the problem,it's probably your breech that's misaligned.
     
  3. mark.177

    mark.177 Donator

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    cross over, usually a problem with cheap mounts or poorly milled scope rails, i do test for this when zeroing. i use sportsmatch mounts and find them very good
     
  4. timmytree

    timmytree Pro Poster

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    Or your dovetails not in line, most problems can be cured with a pair of adjustable mounts.
     
  5. rosie 1

    rosie 1 Engaging Member

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    Im using an R10 with one peice "good quality" mounts and a 300 Qiud scope still had the problem though
     
  6. gasman

    gasman Up a bit,,,,,,,

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    scopes canted or your not holding the gun/scope upright ie your canting the gun
     
  7. Dan77k

    Dan77k Donator

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    Wouldn't you eliminate this problem by resting a spirit bubble on the action to find true horizontal and then align the vertical scope crosshair using a plumb line?
     
  8. mark.177

    mark.177 Donator

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    some pcp's have barrel bands that can be knocked pushing the barrel one way or the other. free floating barrels can get bent. misalignment in the barrel/bore when machined. misalignment of the breach/barrel join...
     
  9. rosie 1

    rosie 1 Engaging Member

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    lol dont think so some how i got more trophies than i go cash lol
     
  10. Lee67

    Lee67 Posting Addict

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    I'd have said canting too...but if u have who loads of trophies..then this wouldn't happen, is the scope plumblined ??...
     
  11. gasman

    gasman Up a bit,,,,,,,

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    you won't need any more help then will you :salute:
     
  12. rosie 1

    rosie 1 Engaging Member

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    always open to advice
     
  13. mikmon

    mikmon Donator

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    stop buying trophies then ;)
     
  14. Lee67

    Lee67 Posting Addict

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    Maybe I should buy some...cos I ain't gonna win any lol
     
  15. terry1001

    terry1001 Major Poster

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    It's likely that the scope is not perfectly centred with the bore and this could be a problem with the mounts and/or the scope rails on the rifle. The mounts tighten from one side only so it's quite possible that they don't sit directly above the bore line, putting them on the other way round may show a difference in the alignment.
    It can be 'cured' by shimming the mounts or by using adjustable mounts if it actually causes a real problem.
    If the rifle is zeroed for windage at your maximum shooting distance (or the maximum you can get consistent groups) then the error between the muzzle and your maximum range should never be greater than the misalignment of the scope/bore. You can easily check this by shooting at various ranges and noting if there is any change in windage as the distance increases. What would be worrying would be if the change was not directly related to the range.
    If you have the tools you could check that the centre of the objective and the centre of the eyepiece are actually directly above the bore line, if they aren't then the options are to shim/fit adjustable mounts or live with it as a known problem requiring you to aim off which can be minimised by zeroing the windage at long range.
     
  16. rosie 1

    rosie 1 Engaging Member

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    In reply to Terry 1001 yep brilliant reply and thanks... bit different to some of the sarchastic reply's!!!! this is exactly what i have done (shim) the mounts which has cured the problem ....my main interest was wondering if other members had aproached the same problem..
     
  17. mark.177

    mark.177 Donator

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    just out of interest, what mounts were you using
     
  18. rosie 1

    rosie 1 Engaging Member

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    Ive changed from a 1 peice to a 2 peice to allow a .010 shim to be inserted beleive it or not its made a 1.1/2inch offset from 10 to 35 yards
     
  19. tomsteebs

    tomsteebs Donator

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    Ditto, I only use bkl mounts now, buy good quality once and don't sell them!
     
  20. tomsteebs

    tomsteebs Donator

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    Look at the mount once it's tightened on your rail, your probably see it is raised at the Allen bolt side and low on the otherside. This is best seen by looking at the gap between the bottom on the mount and the top on the rail.
    Easier to see on flat rails such as found with most pcps.
    Regards
     

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