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Shifting Point of Impact

 
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  #1  
Old 03-17-2012, 02:33 AM
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Join Date: Mar 2007
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Shifting Point of Impact

Hi all, I have just started loading for a 2506 in a tikka t3, found an accurate load with 115 Bergers, having problems with shifting point of impact between groups, does anybody have any ideas as to why this may be happening? Please see attached Photos. Scope is a leupy vx3 2.5-8 if this helps shot off sandbags front and rear

Thanks
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Shifting Point of Impact-target22.jpg   Shifting Point of Impact-image-3-.jpg  

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  #2  
Old 03-17-2012, 08:30 AM
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Re: Shifting Point of Impact

Could be lots of reasons.

Does the picture orientation show the way the targets were hanging when they were shot?

What distance were these shot? Sure it wasn't just wind drift?

How is your parallax and do you feel like you have consistent eye placement behind the scope each time?

VLD bullets are sometimes tough to get consistent if you are seating to a specific OAL. If you aren't already you may want to measure OAL to the bullet ogive as this will give you a much more consistent seating depth.

Scot E.
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Old 03-17-2012, 09:54 AM
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Re: Shifting Point of Impact

My guess same as above, doubt that scope has parallax adj. Next time shooting , line head up more to left, fire 2, then same on right, or up down. See if that sends your groups to same spot, rifle looks like it will shoot. If that is it may want a check piece or stock pack and work on head placement
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Old 03-17-2012, 04:48 PM
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Re: Shifting Point of Impact

The targets were hanging with the dot at the bottom, there was a mild wind that was blowing from time to time, so i am not so much concerned about the horizontal placement of the groups, its the 1.5 minute vertical shift that i am trying to sort out. Loads consisted of Federal brass, federal 210 primer, 57.5gr of retumbo and a berger 115 Hunting VLD seated to jump .006. have been measuring oal from the ogive with the hornady tool. Groups with this load seem to shoot between .3 and .7 for 3 shots at 100m, worked out over about 15 groups.

Thanks
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Old 03-17-2012, 07:03 PM
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Re: Shifting Point of Impact

were you cleaning between each group? that is the only possible problem i can think of :/
__________________

I'm 16
"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth."
~George Washington

"The only advantage a light rifle has is weight, all other advantages go to the heavy rifle."
~ JE Custom

Biggest fail of 2014 so far... http://www.longrangehunting.com/foru...ea-ftf-128972/

My guess on W3P .308 230 Grain Bullet: G1 .740-.755
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  #6  
Old 03-17-2012, 07:14 PM
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Posts: 31
Re: Shifting Point of Impact

No i didn't clean until after the last group. I am really pleased with the group sizes especially for a 7.5lb rifle/scope combo, just need a bit more consistency with POI. its a pretty mild load only doing around 2850 on my chrony. Do you think that going to a B&C composite stock will make a difference? only thing i can think of is maybe a different position of the front stock from group to group
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  #7  
Old 03-17-2012, 07:42 PM
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Join Date: Mar 2012
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Re: Shifting Point of Impact

now that you mentioned stocks your barrel could be rubbing on some part of the stock. take a piece of paper and run it between the barrel and forend to check if it is free floated. it could be different positioning of the front of the stock but check to see if it is free floated
__________________

I'm 16
"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth."
~George Washington

"The only advantage a light rifle has is weight, all other advantages go to the heavy rifle."
~ JE Custom

Biggest fail of 2014 so far... http://www.longrangehunting.com/foru...ea-ftf-128972/

My guess on W3P .308 230 Grain Bullet: G1 .740-.755
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