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100 yard zero changing

 
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  #1  
Old 01-31-2013, 07:52 AM
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Join Date: Dec 2007
Posts: 102
100 yard zero changing

Whenever I go shooting I always start at 100 yards to check my zero. It usually take 1/4 Moa or so in some direction to get it on. The atmospherics are the same plus or minus 10 degrees or so an this is non clean cold bore shooting. I will do nothing to my rifle when I am done shooting, go back next weekend and it is off again. I handle it carefully and it is a leupold mark 4 with badger rings/ base. So I don't think anything is shifting on me. I make sure there is no parallax before I start. Also using the same lot of components. I have noticed it with me with other rifles as well as other people going through the same thing. Anyone else have this problem? What can cause this?
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  #2  
Old 01-31-2013, 01:03 PM
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Join Date: Dec 2007
Posts: 102
Re: 100 yard zero changing

Also it i am firing from the prone off bipods.
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  #3  
Old 01-31-2013, 01:42 PM
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Join Date: Jan 2013
Location: Meridian, Idaho
Posts: 1,378
Re: 100 yard zero changing

So at @ 100 how tight is the grouping? When it is off by .25 moa, is it vertical or horizontal.

If the scope is good, bases etc are tight, and the lug screws torqued properly then my guess is scope to shooter eye alignment is the issue. Your cheek is not lining up exactly the same place and your eye aligment is off. This is not uncommon.
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  #4  
Old 01-31-2013, 01:47 PM
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Join Date: Jul 2007
Posts: 942
Re: 100 yard zero changing

practice shooter positioning, make SURE it's the same each and every time.
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