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7mm Mag Hard Extraction

 
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  #8  
Old 03-22-2011, 05:48 AM
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Location: Tucson Az
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Re: 7mm Mag Hard Extraction

I am sorry to hear that your chamber has a expanded area in front of the belt. Did you buy it used or new? It might be a tough thing to convince Remington that their barrel came that way from the factory, if it is new. They will most likely blame you for shooting a hot load.

If it is used consult a gunsmith. Can't imagine you can polish it out. It would require sanding and that would be difficult with the belted area besides it could make the chamber too large. Probably best to set it back enough to clean it up by rechambering. See what your gunsmith says.
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  #9  
Old 03-22-2011, 07:26 AM
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Re: 7mm Mag Hard Extraction

We got a bad batch of Remington 700's in 7mm Rem Mag early last year.
I bought one and had to pull the barrel. We found a large bur right around the chamber just in front of the step for the case belt.

I could not even fire factory loads with out having to bang the bolt open. The only way I could shoot it was with very light reduced loads.

A number of other rifles had the same problem and were sent back to the shop from where I bought mine. You sound like you got one too. The chamber will need to be recut if it is like mine.

I still have it in the shed having replaced it with a .338 barrel after only a hundred rounds or so.
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  #10  
Old 03-22-2011, 07:19 PM
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Re: 7mm Mag Hard Extraction

What to do, what to do? That is the question. It did fire the factory superformance 162, and the extraction wasn't perfect, but I will always be wondering while I am shooting it IF it is going to eject. I did try calling Remington, but the lines were tied up, and the recording says call back later.Huuum! Go figure. I could rechamber to 7mm Ultra mag using this same barrel. I did consider rechamber to 7mm STW, but the affected portion of the chamber would not be changed at all. That portion is the same on both cartridges. Or, I could set it back a few threads and recut chamber, either way I am still looking at at least a rechamber. And I am almost afraid to send it to the factory nowadays. I have in the past with excellent results, but afraid to now. Maybe it's time to call up Dan Lilja......Frustrated. Really did want to shoot these 168 Berger VLD's. ( sooner than later) Well anyway, AIM SMALL, MISS SMALL, ANY THOUGHTS?
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  #11  
Old 03-23-2011, 06:51 AM
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Re: 7mm Mag Hard Extraction

I would try calling Remington a few more times.

Other options:

You could look for a new 7mm Rem mag takeoff. They are out there. I looked for a new 243 takeoff just a week ago. I posted a WTB on a couple of sites. 6BR gave me five responses in one day. While I haven 't done it, I understand that the barrel might fit without any adjustments for headspace. If not then you will have to pay a bit for headspacing.

On the other hand you would have put a new barrel on it eventually. Might as well do so now. If you want to shoot VLDs give yourself every advantage and buy a reamer with the throat positioned so those long VLDs fit the magazine. Pacific Tool and Gauge made my 7 Rem Mag reamer which has a 1 degree 30 minute angle in the throat. This seems to be the best angle for shooting VLDs as it also worked well in my 257 weatherby and my friend's 22-250, 284 win and 30 AI.

let us know what happens.
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  #12  
Old 03-26-2011, 07:24 PM
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Re: 7mm Mag Hard Extraction

Well guys, I did call big Green, and they told methat i was looking at a 6to 8 week week at minimum. So i contacted my local guy whom I have the utmost faith in and he told me that he has seen this before and strongly beleives it to be a burr in the chamber and that he feels he can polish it out without damaging chamber. We examined the brass and you could clearly see roughness right ahead of the belt all the way around the brass. it was not deep, but upon firing, it "grips" the brass and won't let go with normal extraction assist with the bolt. Down time is less then a week, and for $60.00 , I consider myself lucky. It could be worse, but if this does not work, it is probably going to become a 7mm Ultra-mag. Or I may just re-barrel it with the help of Dan Lilja. I am confident that this will fix the problem. If not, we will see. AIM SMALL, MISS SMALL....7STW
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