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PeterM
Joined: 18 Feb 2003
Posts: 40
Location: Sweden
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| Posted: Thu Apr 24, 2003 8:04 am Post subject: |
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What is according to you the best way of getting rid of the “doughnut" that occurs when reforming/fire forming cases.
/Peter
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cdhunt
Joined: 27 Jan 2004
Posts: 61
Location: hanover, pa
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| Posted: Thu Jan 29, 2004 3:07 pm Post subject: |
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| what do you mean by "doughnut"? |
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PeterM
Joined: 18 Feb 2003
Posts: 40
Location: Sweden
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| Posted: Wed Mar 24, 2004 3:43 am Post subject: |
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When dealing with a wildcat caliber you have to reform a standard case to fit your own. Doughnuts or a ring of thicker material occurs down in the neck when reforming a case so that some of the material from the original case forms the new neck. Thats because the body of a case have thicker material than the neck.
Best regards
/Peter |
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Tankgunner
Joined: 24 Jun 2004
Posts: 38
Location: SW Washington
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| Posted: Mon Jul 12, 2004 11:36 pm Post subject: |
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The doughnut is not limited to wildcat cases. Depending on brass flow and resizing methods it can occur in any cartridge.
The easiest way to handle it is to ensure the driving band (rearmost portion of bullet that is at bore diameter) is at or above the doughnut region. This region is the neck / body junction. If your chamber (and magazine in a field arm) will accommodate this you can ignore the doughnut.
If your bullet encroaches in this area, you need to inside ream the neck all the way past the neck / body junction.
Proper resizing goes a long way to minimize this. Changing brass may help as well. It’s easier to avoid it than it is to correct it.
Hope this helps.
Lee |
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