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Thread: Sighting in / Zeroing a Scope

  1. #1
    Marksman
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    Default Sighting in / Zeroing a Scope

    Hi all, my son and I did a few tests and had some mixed results and need some pointers / help / gatskop or whatever it takes.

    The history goes like this:
    My son has a CZ200 S (4.5mm) and I have a Air Arms S400 (5,5mm FAC).
    *I forgot to add - The 4,5mm pellets JSB Exact 8,44gr and 5,5mm JSB Exact Jumbo 15,89gr.

    We zeroed the rifles at 25m, both are shot off a steady aim and it is outside on a farm.

    The groupings after the zero is a rugged one pellet size hole for both rifles.

    Now then, we shoot quite a lot doing some PC but it felt that we did something wrong as when we took longer shots (on paper targets) the impact seemed to move to the left of the target the further we did the test. Obviously the point of impact was lower on the target if aiming on the "kill zone" of the target due to the trajectory of the pellet, which is understandable but why did the pellets hit to the left on 40m, 50m and 60m? See attached photo of 50m

    What impact does the levelness of the site have on zeroing / sighting in?

    Which other factors may have an influence on the whole story?

    Thanks we'll appreciate some help.
    Hannes and Johann
    Last edited by Plinkhan; 12-06-18 at 16:04. Reason: Add pellet weight.
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  2. #2
    Sharp Shooter

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    A very slight breeze, perhaps not felt at the shooting position but stronger downrange, could be the root cause.
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  3. #3
    Protea FT Team '18/'19
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    Also if the rifle cant to one side the pellet will move to that side.

    But I would also say wind.
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  4. #4
    Sharp Shooter

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    Nice grouping at 50 meters
    The shot placement for both rifles are very consistent to the left. I do not think it's canting of the scope/rifle, because both rifles groupings are to the left.
    (unless you are canting both rifles)

    The most obvious factor I can think of is wind down range. 50meters is far for that pellet to travel, but from experience, if you have more than 6cm at 40meters (by looking at your photo) you should definitely be feeling the wind on your face.

    Let somebody else shoot the rifle with you and see where they group at 40meters, if that's also consistent to your placement, then I would say it's the wind.
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  5. #5
    Protea FT Team '17
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    If possible, shoot in the opposite direction (180)
    If its just wind, you should find your shots toward the other side of the vertical
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  6. #6
    Protea FT Team '16/'18
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    Shoot indoor and see if that happens again, on 50 m a wind at 5km/h will push you 20mm
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  7. #7
    Sharp Shooter

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    According to Chairgun, at 1000m ASL, a 5 km/h crosswind displaces a 8.44 gr JSB pellet departing at 12 ft lbs just more than 4cm at 50m.

    Corresponds to my experience.
    Last edited by kettieklip; 12-06-18 at 22:07.
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  8. #8
    Sharp Shooter
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    Mooi groepies daai. Hou die wind dop, sit windkouse/vlaggies uit as jy kan.
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  9. #9
    REP: Ratel Sporting Airguns
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    Experience I had. Rifle was zeroed at 25m, at 10m poi was to the left and at 40m the poi was to the right.
    Resolved this by rotating one scope mount 180 deg, all sorted.

    Cheers
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  10. #10
    REP: Ratel Sporting Airguns
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    You will see the idea on this pic, had the same problem with a CZ and a Daystate, it's all about the quality scope mounts.

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  11. #11
    Springer FT World Champion '09
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    meh!
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  12. #12
    Springer FT World Champion '09
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    Quote Originally Posted by Machiel View Post
    Shoot indoor and see if that happens again, on 50 m a wind at 5km/h will push you 20mm

    Lies.

    1358!

    40mm

    Markiemarcmarque?
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  13. #13
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    Quote Originally Posted by Bludlust View Post
    Lies.

    1358!

    40mm

    Markiemarcmarque?

    What you on abut now?????
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  14. #14
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    Quote Originally Posted by Kuberboef View Post
    What you on abut now?????

    The difference between hitting 2 x 50m/40mm KZ in a 15km/hr wind - when ALL the Proteas missed them.

    1358 ~ Air Rifle SA Forums
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  15. #15
    SAFTAA FT Colours '18/'19
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    Quote Originally Posted by Machiel View Post
    Shoot indoor and see if that happens again, on 50 m a wind at 5km/h will push you 20mm
    Heavies?
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