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New Rifle won't group ...

 
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  #1  
Old 11-24-2010, 11:46 AM
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New Rifle won't group ...

I recently bought a Savage Model 11 in 7mm-08. I put a Zeiss Conquest 3x9 in Burris Signature rings on it and anxiously went to range to ring out my new hunting rig. I have an older Savage (minus the Accustock and Accutrigger) that is very accurate, but I figured with the improvements on this model, and the higher quality scope, it would really perform.

With five different factory loads (Winchester, Remington, Hornady, Prvi and HSM) I only managed four inch groups at 100 yards. I was expecting quarter sized groups from this rig. I went home frustrated.

I plan to swap out the scope on the next range trip to see if that could be the problem, but the mounting is solid. A check with a boresighter shows that nothing is moving when I give it a couple of good wacks on the muzzle with a rubber mallet.

Since I couldn't get back to the range right away, I decided to slug the barrel and see if anything weird showed up. I found that there was a restriction ahead of the chamber. Once I got it started, I could easily push the slug to within a couple of inches of chamber and then it stopped cold. I had to tap it through with a mallet. I tried a little JB's in the throat in case it was just carbon build up, but the restriction remained. It's hard to say how much the restriction is, but it can't be a lot, since on the second pass the slug feels about the same going down the start of the barrel. It doesn't appear that the slug is being squeezed down a huge amount.

I know that squeezing down a bullet early and having a wider bore at the muzzle is considered "bad for business" in terms of accuracy, but could it cause a barrel to shoot this badly? If this is the problem, what are the odds that I could get Savage to supply a new barrel on Warranty?

Right now I have a $1300 rifle that shoots worse than my SKS ;-(

Last edited by ks_shooter; 11-24-2010 at 02:30 PM.
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  #2  
Old 11-24-2010, 12:28 PM
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Join Date: Feb 2010
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Re: New Rifle won't group ...

Make sure the action screws are tighten properly. I don't own a Savage and don't know anything about this model but with some guns especially with a free floating barrell sometimes the action screws needs to be tightened. This would be a next step. Your gun should be a tack driver in that caliber.
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  #3  
Old 11-24-2010, 12:39 PM
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Re: New Rifle won't group ...

Thanks for the reply.

I neglected to mention that I checked the stock mounting. There is a procedure in the owner's manual for tightening the action screws and Accustock wedge screw. I'm pretty sure the stock mounting is secure.
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  #4  
Old 11-24-2010, 12:56 PM
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Re: New Rifle won't group ...

Quote:
Originally Posted by ks_shooter View Post
I recently bought a Savage Model 11 in 7mm-08. I put a Zeiss Conquest 3x9 in Burris Signature rings on it and anxiously went to range to ring out my new hunting rig. I have an older Savage (minus the Accustock and Accutrigger) that is very accurate, but I figured with the improvements on this model, and the higher quality scope, it would really perform.

With five different factory loads (Winchester, Remington, Hornady, Prvi and HSM) I only managed four inch groups at 100 yards. I was expecting quarter sized groups from this rig. I went home frustrated.

I plan to swap out the scope on the next range trip to see if that could be the problem, but the mounting is solid. A check with a boresighter shows that nothing is moving when I give it a couple of good wacks on the muzzle with a rubber mallet.

Since I couldn't get back to the range right away, I decided to slug the barrel and see if anything weird showed up. I found that there was a restriction ahead of the chamber. Once I got it started, I could easily push the slug to within a couple of inches of chamber and then it stopped cold. I had to tap it through with a mallet. I tried a little JB's in the throat in case it was just carbon build up, but the restriction remained. It's hard to say how much the restriction is, but it can't me a lot, since on the second pass the slug feels about the same going down the start of the barrel. It doesn't appear that the slug is being squeezed down a huge amount.

I know that squeezing down a bullet early and having a wider bore at the muzzle is considered "bad for business" in terms of accuracy, but could it cause a barrel to shoot this badly? If this is the problem, what are the odds that I could get Savage to supply a new barrel on Warranty?

Right now I have a $1300 rifle that shoots worse than my SKS ;-(
I think you've found the problem! The barrel's bore is tighter at the chamber end than the muzzel, and that's a no no! I'd try running a patch thry the first four or five inches of the throat end that's coated with 800 grit lapping compound. Give it about six or eight strokes, and then clean the barrel. Lube it and run a couple tight patches thru it again (might try and keep track where the tight spots are now. If it's still tight, I'd try lapping it again for about five or six strokes. If it's still tight you may have to do it a couple more times. If it's still tight after four lapping sessions, I'd send the rifle back for a new barrel.

Savage is pretty good about their warranty work, so I wouldn't worry too much there. You good have the dealer ship back to them with a letter explaining the issues
gary
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Old 11-24-2010, 01:06 PM
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Re: New Rifle won't group ...

Quote:
Originally Posted by ks_shooter View Post
Thanks for the reply.

I neglected to mention that I checked the stock mounting. There is a procedure in the owner's manual for tightening the action screws and Accustock wedge screw. I'm pretty sure the stock mounting is secure.

being as Savage stole my wedge design (they know it) and never asked. Let me tell you how I did the setup up before it was even a slight thought in their minds. First run the action screws down to where they might have about five or ten inch pounds of torque on them at the max. Now tighten the wedge screw to where it's got about 30 inch pounds of torque (I always lubed the wedge with powdered graphite). After that I torqued the front screw (close to the wedge) to about forty inch pounds, and the other at about 35 inch pounds. How Savage says to do it I don't know, but that's how I was doing it fifteen years ago and it works well (do it in ten inch pound steps by the way).

Also check the tang area of the stock to see if it has clearence. Every Savage rifle I've owned had this area touching, and that's a big no no with them.
gary
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  #6  
Old 11-24-2010, 01:07 PM
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Location: OHIO
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Re: New Rifle won't group ...

You have a bad barrel. Savage should replace it.
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Derek M.
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  #7  
Old 11-24-2010, 07:00 PM
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Re: New Rifle won't group ...

If you try to lap or fix this yourself, and it doesn't work, and then you send it back to Savage, chances are they won't warranty it (the barrel) because you are the one who altered it (the barrel). Send it back as it is if you want them to stand behind their product. If you alter it, you'll own it.
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Last edited by shortgrass; 11-24-2010 at 07:04 PM.
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