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Author Topic: Flattened case neck  (Read 423 times)

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Offline nabob

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Flattened case neck
« on: September 10, 2006, 05:07:30 AM »
I was wondering if the bullet gurus could help me here.

I have a Rem. 7600 in 35 Whelen. When I shoot at the range, I collect my brass (considering getting into reloading). Some spent shells show a slight flattening along the rim of the neck of the case. Not all show this, but many do. Just a short section of "out of round". What could be causing this?
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Offline victorcharlie

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Re: Flattened case neck
« Reply #1 on: September 10, 2006, 01:44:44 PM »
Just a guess, but I'm thinking during extraction and ejection the case has to be hitting the reciever......
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Offline Davemuzz

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Re: Flattened case neck
« Reply #2 on: September 10, 2006, 02:38:39 PM »
Yeah, I have a Winchester Model 88 .308 that does the same thing. The plus is when I go to just neck size the brass, I always know if the brass came from my Winchester or my Savage!

Dave
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Offline cwlongshot

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Re: Flattened case neck
« Reply #3 on: September 11, 2006, 12:59:47 AM »
Quote from: victorcharlie on September 10, 2006, 01:44:44 PM
Just a guess, but I'm thinking during extraction and ejection the case has to be hitting the receiver......

 OR something on the firearm...
 As the  extractor pulls the shell from the chamber there is a  spring is pushing the case to the side. As soon as the case mouth clears the chamber, the mouth of the case has begun to depart the gun, with authority! But the rim is still held by the extractor. The mouth of the case continues out in an arch and impacts the side of the gun, as the rim clears the extractor. Its likely the receiver as Victorcharlie told you. The resulting impact gets you the dented/deforemed case neck/mouths.

 CW
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Offline Questor

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Re: Flattened case neck
« Reply #4 on: September 11, 2006, 01:10:20 AM »
This happens with some semiauto pistols too. Are your dies correcting it?
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Offline nabob

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Re: Flattened case neck
« Reply #5 on: September 13, 2006, 01:45:26 PM »
I appreciate the replies. I noted that it seemed to happen when I pumped the action as it was meant to be worked. If I took it slow and easy, so it would eject into my hand, this did not occur, so I'm guessing the impact theory is correct. Thanks.

I don't reload yet, so I can't answer your question, Questor.

I was having accuracy problems (major accuracy problems) and was wondering if there was something about the chamber that was causing them. That's why the question about the flattened case neck. Turns out, even though I was cleaning the rifle after every eighth shot, I wasn't getting the copper out. Once I realized I still had a copper problem and took care of it, very good accuracy returned. I had been using Hoppe's Benchrest Copper solvent but it wasn't up to the job, apparently. Gunslick Bore Foam took care of the copper and I'm a happy man again. I was ready to sell the rifle, I was so disgusted with the accuracy issues. Now, it is back to sub MOA.
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