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5 shot grouping issues, driving me crazy

 
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  #8  
Old 11-27-2008, 12:12 PM
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Location: Dallas,OR
Posts: 349
Re: 5 shot grouping issues, driving me crazy

Hello, I've had similar issues, Then someone asked me how many shots do I normally get at game? My .02 is if your 3 shots are very consistent you should be happy! 5 shot groups are great, but 1 shot kills are better.
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  #9  
Old 11-27-2008, 07:59 PM
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Re: 5 shot grouping issues, driving me crazy

Quote:
Originally Posted by moombaskier View Post
Hello, I've had similar issues, Then someone asked me how many shots do I normally get at game? My .02 is if your 3 shots are very consistent you should be happy! 5 shot groups are great, but 1 shot kills are better.

Yep. worry more about where the first cold bore shot goes. If it is in that first 3 shot group then I would use 3 shot groups for all load development and not worry about it a bit.
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  #10  
Old 11-27-2008, 11:21 PM
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Join Date: Jul 2004
Location: Texas
Posts: 5,501
Re: 5 shot grouping issues, driving me crazy

First I would try placing the stock on sand bags just in front of or on the front
bedding screw every time for 5 shots and not on the tri pod. this should stop the
tripod from forcing the stock into the barrel.

If that fixes the problem then you need more clearance between the barrel and the
stock.

If none of that works shoot 3 shots and clean then shoot 5 shots and clean if there is a
lot more fouling with 5 shots that could be the problem but only laping or a new custom
barrel can fix a bad fouling barrel.

If the barrel is a light weight conture then it may be just the heating up and to prove
this shoot one round every 10 min to allow it to cool for 5 shots with out cleaning.

Find and fix the problem don't treat the symptoms.

J E CUSTOM
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  #11  
Old 11-28-2008, 12:23 AM
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Re: 5 shot grouping issues, driving me crazy

Quote:
Quote:
Originally Posted by buckbrush View Post
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
That is reeeeeal quick to shoot 5 shots through a 7mm. I know, I have one. The second shot gets it warm and the 3rd shot gets it real warm if shot that quick. Depnding on air/cooling conditions, I will wait anywhere from 5 to 10 minutes between shots. This very well may be your problem... and I also agree with floating your barrel a little more. Another thing... can you stiffin your forearm by bedding an aluminum rod in it with a bedding compund?
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  #12  
Old 11-28-2008, 06:04 AM
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Join Date: Feb 2005
Location: Nevada
Posts: 2,782
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.
Here is my opinion:

1: Open the barrel channel until a sheet of paper folded in three places goes in and out real easy, you need this specially using a bipod. The dollar bill test is a waste of time. After shooting the rifle usually you're able to see where the barrel is rubbing the stock and you may have to open it a bit more.

2: You're asking too much from a magnum to group 5 rounds specially if it's hot. Many long range shooters go for 3 shot groups in their magnum rifles. If it gets real cold out side, then you may get away with it.

3: Make sure the torque in the action bolts is right.

Go shoot your rifle and enjoy it!
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  #13  
Old 11-29-2008, 02:49 PM
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Join Date: Nov 2008
Location: Eastern Montana
Posts: 275
Re: 5 shot grouping issues, driving me crazy

Well,

I reamed the heck out of the barrel channel. I've got lots of clearance there now. I also waited at least five minutes between shots. Unbelieveable. The already tight three shot groups tightened up a bit and no fliers of any kind.

Man, that made my day.

Thanks a lot for all of the help and advice!

Michael.
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