How to test a scope for tracking problems

Discussion in 'General Airgun Chat' started by john0108, Feb 1, 2011.

  1. john0108

    john0108 Member

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    As title please, is there a way to test a scope to make sure the reticle moves as it should?
    Thanks
    John
     
  2. RobF

    RobF Administrator Staff Member

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    called boxing...

    shoot group or shot, click 10 to left and 10 up, shoot group or shot, 20 clicks right shoot group or shot, 20 clicks down, shoot group or shot, 20 clicks left, shoot group or shot, 20 clicks up and the shots should go in 2nd group, 10 clicks right and down, and they should go in first.

    worth also shooting on different mags as well, because mag shift can occur...

    you may find that although a scope clicks, it can fail to move the ret, so look for an uneven box shape... you should have a group at the corner of each square and one in the middle with the above...
     
  3. maestro

    maestro European Champion 2018

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    Try to get a bore sighter and you can test everything with it precisely.
     
  4. neilL

    neilL New Member

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    and as a bonus, if you know the distance you can end up with a calibration for the MOA per click (or clicks for 1 MOA) which may differ slightly to the 1/4 or 1/8 given by the manufacturer - might need more than the 20 clicks but even so it gives a useful number if you use any of the ballistic calculators.


    Neil
     
  5. Scooby

    Scooby Pete Dutton

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    Stick it in a bench mounted vice, adjust the turrets to aim at a mark then zero the turrets.

    You can then move the turrets about & see if the crosshair returns to the original aimpoint each time you zero the turrets.
     
  6. john0108

    john0108 Member

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    Thanks everyone. I can have a play now...
     
  7. Artfull-Bodger

    Artfull-Bodger Member

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    just one word of warning if you stick it in a vice or if your resting on a bench, if your doing it in the garage or at close range, check your scope for parralax movement befoe you start, by moving your head side to side and watching the cross hair, most scopes suffer parralax error when used up close at 5-7yds!

    a mate of mine said his scope was shifting zero all over the place when he tried to set the windage in his garage, I popped down to have a look and the crosshair was wandering almost an inch off the aim point when you moved your head around, yet take it outside and do the same at 20yds and it was fine!
     

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