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7mm STW - Stuck cases, at wits end

 
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  #8  
Old 07-25-2011, 09:13 AM
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Re: 7mm STW - Stuck cases, at wits end

No, this is not a factory chamber or a factory barrel. What are the options to fix it? Set the barrel back and re-chamber? How much setback would you recommend?
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  #9  
Old 07-25-2011, 10:58 AM
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Re: 7mm STW - Stuck cases, at wits end

The amount of set back would depend on how the threads were cut to a degree and how big the back of the chamber actually is. If there is a relief cut for the threads I would set it back at least the length of the threads. If there isn't a relief cut and you or a gunsmith feel confident you can get the cutter back in the threads then you can possibly go shorter. If it was me I'd cut the threads off and recut the threads to make sure it cleaned the chamber. I'd get a 7mm range rod to dial the barrel back in off the bore.
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  #10  
Old 07-25-2011, 12:03 PM
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Re: 7mm STW - Stuck cases, at wits end

Thanks for the advise. Is there a way to make a mold of the chamber to compare against SAMMI specs?
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  #11  
Old 07-25-2011, 12:44 PM
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Re: 7mm STW - Stuck cases, at wits end

Brownells sells the stuff to do chamber castings. It's best to remove the barrel and then you plug the bore to do it.

I haven't measured my reamer but if I remember right it's suppose to be .512 right in front of the belt. So yours is probably at least .516 and I wouldn't be surprised if it was .518 or more. The amount of set back will change with the size of the chamber. I'm pretty sure a STW/8mm Mag is .512 at the base and .495 at the shoulder. So the more it is oversized the more you'll have to set it back to clean the chamber since the case has very little taper per inch. If the reamer goes in true with the bore it will be less than .001 over the reamer size.
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  #12  
Old 07-25-2011, 12:56 PM
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Re: 7mm STW - Stuck cases, at wits end

This may be a dumb question, but why would an oversized chamber cause the case to stick?
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  #13  
Old 07-25-2011, 01:21 PM
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Re: 7mm STW - Stuck cases, at wits end

I'm not 100% sure why it does it with a oversized chamber. I think it's because the brass extends beyond it's normal range too many times and becomes less elastic (work hardens). So upon firing it wont spring back off of the chamber walls. I would assume new cases are less likely to do it?
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  #14  
Old 07-25-2011, 03:13 PM
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Re: 7mm STW - Stuck cases, at wits end

Yes, new cases are less likely to stick, 1 out of 20 maybe. Even then the bolt would extract with a bit of effort. Fireformed cases are 1 in 3 and they have to be tapped out with a cleaning rod.
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