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Arbitrary POI change. Can you help?

 
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  #1  
Old 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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Old 12-29-2006, 10:33 AM
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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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Old 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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Old 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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Old 12-29-2006, 12:15 PM
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Location: Blighty
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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  
Old 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  
Old 12-29-2006, 06:00 PM
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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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