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#6195206 - 02/19/12 11:18 PM Help diagnose this group
Pharmseller Offline
Campfire Ranger

Registered: 01/19/10
Posts: 2106
Loc: Willamette 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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#6195226 - 02/19/12 11:23 PM Re: Help diagnose this group [Re: Pharmseller]
mcmurphrjk Online   content
Campfire Guide

Registered: 03/05/08
Posts: 3464
Loc: Northern Nevada
Scope good?
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#6195400 - 02/20/12 12:07 AM Re: Help diagnose this group [Re: mcmurphrjk]
SodFarmer Offline
Member

Registered: 01/15/03
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 - 02/20/12 12:10 AM Re: Help diagnose this group [Re: SodFarmer]
rifle Offline
Campfire Tracker

Registered: 01/31/06
Posts: 5717
Loc: now in SC
What kind of rifle?bedded? scope? good rest? details...
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#6195504 - 02/20/12 12:26 AM Re: Help diagnose this group [Re: rifle]
mjbgalt Offline
Campfire Tracker

Registered: 01/29/08
Posts: 6495
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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#6195547 - 02/20/12 12:37 AM Re: Help diagnose this group [Re: mjbgalt]
dye7barrel Offline
Campfire Ranger

Registered: 04/09/08
Posts: 2175
Loc: Washington
Barrel freedloated? Keep the info coming.

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#6195642 - 02/20/12 01:01 AM Re: Help diagnose this group [Re: dye7barrel]
Pharmseller Offline
Campfire Ranger

Registered: 01/19/10
Posts: 2106
Loc: Willamette 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
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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

Member #547

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#6195791 - 02/20/12 01:37 AM Re: Help diagnose this group [Re: Pharmseller]
Tanner Online   content
Campfire 'Bwana

Registered: 03/01/11
Posts: 10319
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 - 02/20/12 01:40 AM Re: Help diagnose this group [Re: Pharmseller]
Ackleyfan Online   content
Campfire Tracker

Registered: 03/10/02
Posts: 6304
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 - 02/20/12 02:43 AM Re: Help diagnose this group [Re: Ackleyfan]
Pharmseller Offline
Campfire Ranger

Registered: 01/19/10
Posts: 2106
Loc: Willamette 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

Member #547

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