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My scope is a little off

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  #1  
Unread 01-31-2009, 10:17 PM
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Join Date: Dec 2007
Location: Utah
Posts: 33
My scope is a little off

Hey guys,

I just got back from the range and discovered that my scope has "twisted" a little counter clockwise.

When dialed in at 100 yards I was dead center verticle. When I dialed up my scope about 44 clicks, I was 11" high but about 1 3/4 to the right.

My scope bases and gun were level while shooting because I have an anticant level.

My question is: should I tweak the scope mount or just adjust for it?

I haven't ever mounted a scope before so I'm hesitant to loosen it and screw it up worse.

Any thougts?


Thanks
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  •   #2  
    Unread 02-01-2009, 12:16 AM
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    Join Date: Jun 2005
    Location: Yakima, Washington
    Posts: 3,832
    Re: My scope is a little off

    Check out this article by Darrell Holland.

    http://www.longrangehunting.com/articles/reticle-perpendicularity.php
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      #3  
    Unread 02-01-2009, 12:25 AM
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    Join Date: Dec 2007
    Location: Utah
    Posts: 33
    Re: My scope is a little off

    7MM,

    That perpendicular test is exactly what I did. Should I go ahead and try to correct it?

    It seems that 1 3/4 inches drift at 100 yards from zero to 44 clicks would be a lot out at 700 - 800 yards.


    Thanks
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      #4  
    Unread 02-01-2009, 12:27 AM
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    Join Date: Jun 2005
    Location: Yakima, Washington
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    Re: My scope is a little off

    You're right, it would be way off at longer ranges. You need to adjust it so it's right.
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      #5  
    Unread 02-01-2009, 10:55 PM
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    Join Date: Feb 2004
    Location: Pennsyltucky
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    Re: My scope is a little off

    just remember, your 100 yd zero will be off when you rotate that scope. you'll have to shoot a group at 100, draw a verticle line with a level, crank up the scope and shoot another group to see if it's tracking vertically. then re-zero at 100 when you get it tracking straight.
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      #6  
    Unread 02-01-2009, 11:28 PM
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    Join Date: Dec 2007
    Location: Utah
    Posts: 33
    Re: My scope is a little off

    Thanks guys,

    I rotated the scope just a hair and will go re-zero tomorrow and check it again.

    I have to be on for my barbary sheep hunt coming up!
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      #7  
    Unread 02-02-2009, 11:15 AM
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    Join Date: Feb 2008
    Location: Mesa, AZ
    Posts: 69
    Re: My scope is a little off

    This is a link to something written by Paul Coburn aka Catshooter. This is THE best write up on understanding how a scope works and getting it setup properly on your rifle, in my opinion.

    Scope level -

    What you are experiencing is called crabbing. Some scopes don't track in a perfectly straight line and the scope has to be tweaked slightly to account for this. I had to do this with my Bushnell 4200 Tactical 6-24x50 scope.
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