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5 shot grouping issues, driving me crazy

 
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  #1  
Old 11-26-2008, 11:42 PM
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Join Date: Nov 2008
Location: Eastern Montana
Posts: 280
5 shot grouping issues, driving me crazy

Hi everyone,

Not new to the forum. I've been trolling for a long time but an issue with one of my guns made me decide to join and ask for help.

I have a 7 mm Rem mag in a 110 Savage action. I had a heavy varmint Shilen barrel installed. It's 26" long 1:9 twist. I've been shooting VLD 168's and have a consistant issue that is driving me nuts, but I may have found the problem this afternoon.

When I shoot a five shot group, I am fairly consistently getting a cloverleaf out of three shots, then two fliers about an inch from the nice tight group. It happens with different powders and different charges...but almost always, if I do my part, will group three together then spray two others.

The stock is just one of those Bell and Carlson Duramax's and I made sure that when I installed it the barrel was floated so that I could slide a dollar bill the length of the barrel. This was fine while the gun was upright resting on the recoil pad, however, when the gun is on the benchrest or on the bipod, the stock will flex and make contact on the right side of the barrel channel.

Could this be my problem? I can ream it out easy enough but wanted some peace of mind more than anything.

Thanks guys. Great site by the way.

Michael.
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  #2  
Old 11-26-2008, 11:54 PM
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Join Date: Nov 2008
Posts: 1,057
Re: 5 shot grouping issues, driving me crazy

GiDay Mate,

Just accept that your rifle may not be able to group 5 shots into the one hole.

As your barrel gets hot the internal stresses within the barrel metal cause the barrel to change shape. Some barrels do it more than others.

My advice is to fire a couple of shots, wait until the barrel cools completely then fire a few more. See if this helps before you start pulling your rifle apart.
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  #3  
Old 11-26-2008, 11:57 PM
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Join Date: Jul 2007
Location: Idaho
Posts: 366
Re: 5 shot grouping issues, driving me crazy

What are you doing to prep your brass? Try the 162 Amax
with IMR 4350 has worked well for us.............
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  #4  
Old 11-27-2008, 12:42 AM
KRP KRP is offline
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Join Date: Dec 2007
Location: Kuna, ID
Posts: 594
Re: 5 shot grouping issues, driving me crazy

A dollar bill isn't enough clearance for the barrel in my opinion, especially with a stock that is known to flex. The B&C is better than the factory Savage plastic piece but it still flexes quite a bit. I also think 5 fairly quick shots from a 7 mag is enough to heat that barrel up and change POI, you don't give a time frame for your 5 shot strings.
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  #5  
Old 11-27-2008, 09:48 AM
Silver Member
 
Join Date: Nov 2008
Location: Eastern Montana
Posts: 280
Re: 5 shot grouping issues, driving me crazy

The shots were not rapid fire but I usually don't allow the barrel to cool a lot between shots. I'd say the five shots were fired in about a minute and a half or two minutes.

To prep the brass, I have been neck sizing, deburring the flash hole and trimming to 2.500".

Thank you
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  #6  
Old 11-27-2008, 10:50 AM
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Join Date: Oct 2005
Location: Michigan
Posts: 2,232
Re: 5 shot grouping issues, driving me crazy

I'd definitely open up the barrel channel to completely eliminate the contact between stock and barrel.

Good luck,
AJ
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  #7  
Old 11-27-2008, 11:19 AM
Lightvarmint
 
Posts: n/a
Re: 5 shot grouping issues, driving me crazy

Quote:
Originally Posted by buckbrush View Post
Hi everyone,

Not new to the forum. I've been trolling for a long time but an issue with one of my guns made me decide to join and ask for help.

I have a 7 mm Rem mag in a 110 Savage action. I had a heavy varmint Shilen barrel installed. It's 26" long 1:9 twist. I've been shooting VLD 168's and have a consistant issue that is driving me nuts, but I may have found the problem this afternoon.

When I shoot a five shot group, I am fairly consistently getting a cloverleaf out of three shots, then two fliers about an inch from the nice tight group. It happens with different powders and different charges...but almost always, if I do my part, will group three together then spray two others.

The stock is just one of those Bell and Carlson Duramax's and I made sure that when I installed it the barrel was floated so that I could slide a dollar bill the length of the barrel. This was fine while the gun was upright resting on the recoil pad, however, when the gun is on the benchrest or on the bipod, the stock will flex and make contact on the right side of the barrel channel.

Could this be my problem? I can ream it out easy enough but wanted some peace of mind more than anything.

Thanks guys. Great site by the way.

Michael.
Something to try.......... When testing loads, next time try a mirage shade when working up loads (after the barrel channel is relieved to prevent the stock from changing the barrel harmonics).

Lightvarmint
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