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#6195206 - 02/19/12 03:18 PM Help diagnose this group
Pharmseller Offline
Campfire Regular

Registered: 01/18/10
Posts: 926
Loc: Wilamette Valley, Oregon
I shot this group today.
7mm-08
120 gr NBT
50.0 gr Ramshot Big Game
CCI 200 primers
Remington brass
Loaded 0.015" off the lands.
100 yards



The fifth shot was from a bit of a warm barrel, but as you can see I'm stumped as to why I'm getting shots touching close to 2 inches apart.

A previous 3 shot group has the same pattern, with two shots touching and a third 0.53" out.

What should I try to tighten the group?


P
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We are determined that before the sun sets on this terrible struggle, our flag will be recognized throughout the world as a symbol of freedom on the one hand, of overwhelming power on the other.
General George C. Marshall, 1942


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#6195226 - 02/19/12 03:23 PM Re: Help diagnose this group [Re: Pharmseller]
mcmurphrjk Online   content
Campfire Guide

Registered: 03/04/08
Posts: 2903
Loc: Northern Nevada
Scope good?
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#6195400 - 02/19/12 04:07 PM Re: Help diagnose this group [Re: mcmurphrjk]
SodFarmer Offline
Member

Registered: 01/14/03
Posts: 61
Loc: Iowa
I would shoot a few more groups with different charges and powders to see if you get a better result. I had a similar experience with one of my rifles and I could not find a powder or a charge that would work. In the end, I switched bullets to a different brand and the problem went away. It could be that your barrel doesn't like that particular bullet.

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#6195412 - 02/19/12 04:10 PM Re: Help diagnose this group [Re: SodFarmer]
rifle Offline
Campfire Guide

Registered: 01/31/06
Posts: 4766
Loc: Tar Heel,Banana City
What kind of rifle?bedded? scope? good rest? details...
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My rule of life prescribed as an absolutely sacred rite smoking cigars and also the drinking of alcohol before, after and if need be during all meals and in the intervals between them.
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#6195504 - 02/19/12 04:26 PM Re: Help diagnose this group [Re: rifle]
mjbgalt Online   content
Campfire Guide

Registered: 01/28/08
Posts: 4926
Loc: ohio
how good was your rest? if you don't have a consistent rest you'll string them like that. use a bag under the buttstock also.
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THIS IS NOT DRESS REHEARSAL

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#6195547 - 02/19/12 04:37 PM Re: Help diagnose this group [Re: mjbgalt]
dye7barrel Online   content
Campfire Regular

Registered: 04/08/08
Posts: 1204
Loc: Washington
Barrel freedloated? Keep the info coming.

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#6195642 - 02/19/12 05:01 PM Re: Help diagnose this group [Re: dye7barrel]
Pharmseller Offline
Campfire Regular

Registered: 01/18/10
Posts: 926
Loc: Wilamette Valley, Oregon
Good rest. Sandbags fore and aft.
Scope - Minox ZA3, Talley lightweight mounts. All screws tight.
Rifle: Weatherby Ultra Lightweight.
Not bedded.
Ultra Lightweights are supposed to like a little upward pressure on the barrel.
Not freefloated.
Fired at 6X.

What bothers me is the consistency of the inconsistency. If the scope or mounts were bad I would expect more variance.

Here's the 3 shot group I fired before the 5 shot group. This group measures 0.93" center to center. After I fired this group I let the barrel cool then adjusted the scope 10 clicks up and 3 clicks left.



P
_________________________
We are determined that before the sun sets on this terrible struggle, our flag will be recognized throughout the world as a symbol of freedom on the one hand, of overwhelming power on the other.
General George C. Marshall, 1942


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#6195791 - 02/19/12 05:37 PM Re: Help diagnose this group [Re: Pharmseller]
Tanner Online   content
Campfire Outfitter

Registered: 02/28/11
Posts: 7991
Loc: High Country Colorado
Something you'll hear over and over again about "2 in, 1 out" type groups is to try seating in a little deeper. Lots of guys have seen groups shrink and become nice tight little triangles or clusters with that method.

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#6195807 - 02/19/12 05:40 PM Re: Help diagnose this group [Re: Pharmseller]
Ackleyfan Online   content
Campfire Guide

Registered: 03/10/02
Posts: 4914
Base screws that are tight don't mean the bases are tight, Bases should be installed 1 screw at a time to make sure the bases are being held tight by both screws!

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#6196098 - 02/19/12 06:43 PM Re: Help diagnose this group [Re: Ackleyfan]
Pharmseller Offline
Campfire Regular

Registered: 01/18/10
Posts: 926
Loc: Wilamette Valley, Oregon
Originally Posted By: Ackleyfan
Base screws that are tight don't mean the bases are tight, Bases should be installed 1 screw at a time to make sure the bases are being held tight by both screws!


I'm trying to visualize what you mean and it just isn't happening.

P
_________________________
We are determined that before the sun sets on this terrible struggle, our flag will be recognized throughout the world as a symbol of freedom on the one hand, of overwhelming power on the other.
General George C. Marshall, 1942


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