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#6195206 - 02/19/12 Help diagnose this group  
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Pharmseller Offline
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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

[Linked Image]

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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CMG 300 BP

#6195226 - 02/19/12 Re: Help diagnose this group [Re: Pharmseller]  
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mcmurphrjk Online content
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Scope good?


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#6195400 - 02/19/12 Re: Help diagnose this group [Re: mcmurphrjk]  
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SodFarmer Offline
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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.

#6195412 - 02/19/12 Re: Help diagnose this group [Re: SodFarmer]  
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rifle Offline
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What kind of rifle?bedded? scope? good rest? details...


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#6195504 - 02/19/12 Re: Help diagnose this group [Re: rifle]  
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mjbgalt Online content
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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.


I put Varget on my cornflakes...
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Alpha

#6195547 - 02/19/12 Re: Help diagnose this group [Re: mjbgalt]  
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dye7barrel Offline
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Barrel freedloated? Keep the info coming.

#6195642 - 02/19/12 Re: Help diagnose this group [Re: dye7barrel]  
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Pharmseller Offline
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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.

[Linked Image]

P



Obey lawful commands. Problem solved.

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#6195791 - 02/19/12 Re: Help diagnose this group [Re: Pharmseller]  
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Tanner Online content
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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.

#6195807 - 02/19/12 Re: Help diagnose this group [Re: Pharmseller]  
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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!

#6196098 - 02/19/12 Re: Help diagnose this group [Re: Ackleyfan]  
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Pharmseller Offline
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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



Obey lawful commands. Problem solved.

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Bravo

#6196153 - 02/19/12 Re: Help diagnose this group [Re: Pharmseller]  
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MichiganScott Online content
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Need to play with the distance off the lands. With that much vertical dispersion the bullet has to be leaving the barrel midway through the cycle instead of at the top or bottom of the oscillation.


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#6196189 - 02/19/12 Re: Help diagnose this group [Re: Pharmseller]  
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Kenneth Online content
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I'm surprised people aren't jumping up and down over the

"not free-floated" statement....

#6196213 - 02/19/12 Re: Help diagnose this group [Re: Pharmseller]  
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Karnis Offline
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TX & WV
Originally Posted by Pharmseller
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


On more than one occasion I have had Talley base screws be too long. It will play hell with your groups if the very front one is touching the threads on the barrel. To check, remove the front screw and peer down the hole with a good light. If it's too long, you will see the shiny spots on the top of the barrel threads.

That will prevent the base from seating even if you tighten it gorilla tight. Trust me on this one............

#6197570 - 02/20/12 Re: Help diagnose this group [Re: Pharmseller]  
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CLB Offline
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Is this the same rifle you bought from Wareagle?

Maybe exchange a couple PM's w/him and see what load worked for him and start there.

Have you made ANY modifications to this rifle?

Maybe premature, but don't be afraid to remove the pressure point. After loading and shooting at least 6 bee U/L's I'll say I disagree with your logic.

Do you have your "forward" bag close to the bottom metal? or out really far? If it's too far out (close to stud) you might be placing torque on the tube.

Might also be as simple as your load combo. Do you have any 140's hanging around along with some IMR4350? if so, toss in 46 grains with 140 Nos and give it a whirl...

I'd also start my loads closer and seat deeper as/if I feel i needed to.

Last edited by CLB; 02/20/12.
#6197644 - 02/20/12 Re: Help diagnose this group [Re: Karnis]  
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CLB Offline
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Karnis has a very good point here and I saw the same exact thing on my pards Weatherby in 7-08 with Talley U/L's. Everything came together quick after that was fixed.

Last edited by CLB; 02/20/12.
#6197911 - 02/20/12 Re: Help diagnose this group [Re: CLB]  
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Bowman44 Offline
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I agree with CLB, this seems to be a bedding/pressure issue on the action or barrel most likely. Strange things can happen, but likely its due to different pressures being put on the action or barrel or both. T.S.

#6198470 - 02/20/12 Re: Help diagnose this group [Re: Bowman44]  
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Popapi Offline
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I'm willing to BET THE FARM you have everything right, to say the least it's the rifle I had a WBY UL in 25-06 that did the same thing no matter what I did I COULD NOT GET IT TO SHOOT..............in turn I sent the rifle to Hill Country rifles to accurized and it came back shooting 1/2" groups with 100grn TSX...... Good luck on your rifle!

http://hillcountryrifles.com/pages/accurizing

#6198541 - 02/20/12 Re: Help diagnose this group [Re: CLB]  
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Pharmseller Offline
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Pharmseller  Offline
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Willamette Valley, Oregon
Yep, bought it from Wareagle. IIRC he never shot it.
I'm going to check the scope mounts and seat the bullets a little deeper. I'll also remove her from the stock and reattach, paying attention to keeping the barrel centered in the channel.
I'm getting conflicting advice regarding the bedding screws. Some say tighten the rear screw first, some say the front screw first. What this tells me is there is no hard and fast rule.
I'll report back how she does. The next step (if necessary) will be removing the pressure points in the stock.

Thanks all for the help. This is kinda like watching "House."

P



Obey lawful commands. Problem solved.

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#6198544 - 02/20/12 Re: Help diagnose this group [Re: Popapi]  
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Pharmseller Offline
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Pharmseller  Offline
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Willamette Valley, Oregon
Originally Posted by Popapi
I'm willing to BET THE FARM you have everything right, to say the least it's the rifle I had a WBY UL in 25-06 that did the same thing no matter what I did I COULD NOT GET IT TO SHOOT..............in turn I sent the rifle to Hill Country rifles to accurized and it came back shooting 1/2" groups with 100grn TSX...... Good luck on your rifle!

http://hillcountryrifles.com/pages/accurizing


$500.
Hoo doggy that's a chunk of change.

P



Obey lawful commands. Problem solved.

Member #547
#6198610 - 02/20/12 Re: Help diagnose this group [Re: Pharmseller]  
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1minute Offline
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I'd suggest free floating first. If that does not help then check to see if the bedding is stressing ones action. The way I check that is to install a gridded bore sighter and note the crosshair coordinates. Loosen ones action screws and see if the coordinates change at all. If there is any shift at all, then bed the receiver in a completely relaxed state. Had to do that to a Weatherby Mark V and it came around beautifully.


1Minute
#6198672 - 02/20/12 Re: Help diagnose this group [Re: 1minute]  
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mjbgalt Online content
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i do it like this:

scope, then bedding. then handload shorter or longer.


I put Varget on my cornflakes...
Inventor, fart lok Scent control
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