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7mm STW - Stuck cases, at wits end

 
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  #1  
Old 07-24-2011, 10:03 PM
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7mm STW - Stuck cases, at wits end

I've got a 7mm STW, actually it's my buddies, that the cases stick after being fired. The bolt lift is fine, not stiff at all, with the bolt completly up we have to tap the case out with a cleaning rod. Last Saturday at the range we tested 7 different loads, 180 Berger VLD .010 off the lands, Federal 215M primer, 73 - 76 grains Retumbo in .5 grain increments. Everything was shot over a chronograph to verify velocities. At times the stuck case seems completely random. The load with 74 grains stuck, the load with 76 grains did not. After the case is tapped out of the chamber you can see an very obvious mark in front of the belt where the case rubbed against the chamber. We have checked and double checked the headspace, replaced the bolt handle to ensure primary extraction and replaced the extractor.

Any ideas what is wrong with rifle? Could the chamber be rough or out of round?
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  #2  
Old 07-24-2011, 10:36 PM
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Re: 7mm STW - Stuck cases, at wits end

The chamber needs to be polished. It happens. Unless you have done that already I would give it a try.
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Old 07-24-2011, 11:07 PM
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Re: 7mm STW - Stuck cases, at wits end

If it's a factory chamber the back of the chamber can be oversized also. For that matter even a custom chamber could be oversized if the back of the reamer wasn't straight when it was pushed in the barrel. What do the cases measure in front of the belt? Are there ring marks in the cases?
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Old 07-24-2011, 11:23 PM
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Re: 7mm STW - Stuck cases, at wits end

The chamber is screwed up. Don't fool around with it, just send the rifle back to whoever 'smithed it, or to the manufacturer if it's factory original.
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Old 07-25-2011, 12:29 AM
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Re: 7mm STW - Stuck cases, at wits end

Quote:
Originally Posted by IdahoCTD View Post
If it's a factory chamber the back of the chamber can be oversized also. For that matter even a custom chamber could be oversized if the back of the reamer wasn't straight when it was pushed in the barrel. What do the cases measure in front of the belt? Are there ring marks in the cases?
Right in front of the belt it measures .510. There is a ring around the case where it appears to get stuck and it measures .515 at that ring.
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  #6  
Old 07-25-2011, 12:32 AM
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Re: 7mm STW - Stuck cases, at wits end

Here is a picture of two fired cases. You can see where the case appears to get stuck in the chamber about .050 in front of the belt.


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  #7  
Old 07-25-2011, 12:43 AM
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Re: 7mm STW - Stuck cases, at wits end

Sounds like a oversized chamber. When a friend and I tought ourselves to chamber rifles we used the tailstock to push the reamers in and had several oversized chambers, one was a STW just like yours and the brass came out right at .515-.516. I had the same problem with sticking brass. We later correct the tailstock but also went to a floating reamer holder. Is it a factory chamber?
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