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Reloading Berger Bullets

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Arbitrary POI change. Can you help?

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  #1  
Unread 12-29-2006, 10:19 AM
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Arbitrary POI change. Can you help?

Don't know what forum this belongs in but it's been bugging me for a while now. So, here goes. Steyr rifle shoots 1/2 to 3/4 groups all day long but one day the group is dead center at a hundred. The next day it is still a tight group but now it is two inches left of center. Next range session it is 3 inches low or three inches high. Never seems to be in the same place. I sighted in for a long range hunt before christmas and was printing 1 inch at two hundred. Did not get a chance to shoot that day. Yesterday I shot the rifle and the group was still one inch but now is two inches below the bull at two hundred. What am I doing wrong. I reload and the rounds are from the same batch. what are some causes of this?
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  •   #2  
    Unread 12-29-2006, 10:33 AM
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    Join Date: Aug 2006
    Location: Hatchet City, AB,Canada
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    Re: Arbitrary POI change. Can you help?

    First thing I would check would be my scope and mounts. These can sometimes come loose and move around.

    Next make sure the stock hasn't warped @ all and isn't touching the barrel.

    Blygy
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      #3  
    Unread 12-29-2006, 11:14 AM
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    Re: Arbitrary POI change. Can you help?

    That was my first thought also. If the scope or mounts were loose it would not print a tight group. Must be the stock. I can't find any rub marks on the stock and I can run a dollar bill around the barrel all the way down to the receiver so I know that it is free floated. I've been shooting for 35 years and just can't seem to put my head around this issue. Thanks for the help
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      #4  
    Unread 12-29-2006, 11:57 AM
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    Re: Arbitrary POI change. Can you help?

    Are there drastic temp/humidity/air pressure changes between sessions?
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      #5  
    Unread 12-29-2006, 12:15 PM
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    Join Date: Sep 2003
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    Re: Arbitrary POI change. Can you help?

    Rather than equipment, I would suspect that your 'position and hold' from occasion to occasion may be different.

    -different surface under your bipod?
    -leaning into the bipod for 1 group; but not the next?
    -pulling the rifle into your shoulder for 1 group but not the next?
    -differing cheek pressure on the stock etc............

    All the best

    Matt
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      #6  
    Unread 12-29-2006, 04:23 PM
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    Re: Arbitrary POI change. Can you help?

    Wood stock?
    db
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      #7  
    Unread 12-29-2006, 06:00 PM
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    Join Date: Jan 2002
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    Re: Arbitrary POI change. Can you help?

    I seconded Browndog assessment. Your not consistent with the way you hold the rifle or how you approached the scope.
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