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New barrel grouping issue - Please Help

 
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  #1  
Old 04-29-2012, 12:04 PM
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Join Date: Apr 2008
Location: South Africa
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New barrel grouping issue - Please Help

Hello

My friend recently fitted a new 28 inch barrel to his 243, 1:10 twist. He usually reloads and the previous barrel shot sub MoA groups at 200 yards with a 24 inch barrel. The bullets he was using was 87 V MAx with winchester brass. The rifle is fitted with a Leupold VX3.

He broke in the barrel by cleaning the barrel after each shot and letting it cool properly. He shot 20 bullets through the barrel after he decided to site it in. The groupings are sporadic at best. He would group 3 shots and then it would start going everywhere.

The problems he has considered are the following:

The gunsmith may made a mistake with the fitting of the barrel and it will be taken in shortly.

Problem with brass which will be replaced with Norma brass.

What other problems can there be?

He is a good shot and quite meticulous when reloading. Can the bullets be too light or too heavy for the twist?

Any suggestions will be highly appreciated.
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  #2  
Old 04-29-2012, 02:22 PM
KRP KRP is offline
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Join Date: Dec 2007
Location: Kuna, ID
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Re: New barrel grouping issue - Please Help

All the basics have been checked? Rings, base, scope, bedding?
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  #3  
Old 04-29-2012, 04:56 PM
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Join Date: Aug 2009
Posts: 693
Re: New barrel grouping issue - Please Help

never had luck with 87gr V-max bullets in my 6BR that's 1:8 twist... But 90gr Berger make one hole groups, must be something about them V-max my barrel doesn't like ;-) and winchester brass common ;-) get some lapua or norma brass if you after precision shooting.
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  #4  
Old 04-29-2012, 07:14 PM
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Join Date: Jun 2010
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Re: New barrel grouping issue - Please Help

Quote:
Originally Posted by Jinx View Post
Hello

My friend recently fitted a new 28 inch barrel to his 243, 1:10 twist. He usually reloads and the previous barrel shot sub MoA groups at 200 yards with a 24 inch barrel. The bullets he was using was 87 V MAx with winchester brass. The rifle is fitted with a Leupold VX3.

He broke in the barrel by cleaning the barrel after each shot and letting it cool properly. He shot 20 bullets through the barrel after he decided to site it in. The groupings are sporadic at best. He would group 3 shots and then it would start going everywhere.

The problems he has considered are the following:

The gunsmith may made a mistake with the fitting of the barrel and it will be taken in shortly.

Problem with brass which will be replaced with Norma brass.

What other problems can there be?

He is a good shot and quite meticulous when reloading. Can the bullets be too light or too heavy for the twist?

Any suggestions will be highly appreciated.
try this: Run a very tight patch thru the barrel. Marking all the tight spots and loose spots in there. If the last four inches are loose, then you need to either cut the barrel back to where it's tight on exiting the barrel, or plan of doing a bore lap job. I think it was Calfee that said that a 30" blank was only good for 26" at the most. Did they install a muzzel brake at the end of the barrel or do any machining that involved the last six inches of barrel? Lastly, I'd remove the action and have a good look at the recoil lug and where it seats. If it looks good then reinstally the action and use a good torque wrench. Start out with 35 in. lb. and adjust the torque from there. But don't go much over 50 in.lb.
gary
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  #5  
Old 04-29-2012, 08:29 PM
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Join Date: Oct 2009
Location: Texas panhandle
Posts: 259
Re: New barrel grouping issue - Please Help

all barrels like different bullets, or different powder charges. what was the twist on the old barrel? has he tried seating the bullets at different lengths? i am now a firm believer in finding the "sweet spot" before finding the correct powder or powder charge. with a different length barrel i believe he will just have to start over finding a load that it likes.
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  #6  
Old 04-30-2012, 05:48 AM
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Join Date: Mar 2005
Posts: 35
Re: New barrel grouping issue - Please Help

Lots of good information in posts above - also don't neglect checking the crown.

Dan
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  #7  
Old 04-30-2012, 11:38 AM
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Join Date: Jun 2010
Location: greenwood, IN
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Re: New barrel grouping issue - Please Help

Quote:
Originally Posted by rem.xp100 View Post
Lots of good information in posts above - also don't neglect checking the crown.

Dan
Normally a bad crown will push a bullet in one direction only unless it's bad all the way around. It's not all that common for a bad crown to be bad all the way around, but I saw one factory barrel that was bad 360 degrees once. That is possible for sure, and easy to spot with a strong light and a magnifing glass.
gary
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