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Old October 21, 2006, 01:57 AM   #1
Join Date: April 15, 2006
Posts: 69
Strange marks on .357 cases :confused: (large pic)

Hi Guys, while de priming my .357 cases last night i noticed these strange marks on them. What could be causing this? The case on the right has not been de primed as yet. I am using a Lee Turret press with Lee dies. I notice a similar problem when loading my 9mm cases as well.
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Old October 21, 2006, 03:57 AM   #2
Join Date: December 20, 2005
Location: Rural-not for long- Virginia
Posts: 60
Try cleaning the dies.
Pull the decapping pin and clean the die like you would a gun barrel and see if the striation don't disappear.
If by strange marks you mean the line just above the rim, it is the limit of the sized region of the case, i.e., the lowermost travel of the case into the die.
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Old October 21, 2006, 04:58 AM   #3
Join Date: April 15, 2006
Posts: 69
Will try cleaning the dies like you say. By marks , i mean the long black lines on the two cases. Compare it to the case on the right.
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Old October 21, 2006, 08:37 AM   #4
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Location: Pennsylvania
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Probably powder fouling on the cylinder and case from firing, compressed onto the brass during resizing. Try a different powder that may be cleaner burning. What are you using now?
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Old October 21, 2006, 02:11 PM   #5
silicon wolverine
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Join Date: April 28, 2006
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dirty dies. i have to clean mine about every 2500 rounds or the brass cojes out looking like that.

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Old October 21, 2006, 02:50 PM   #6
Join Date: April 15, 2006
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the problem seemed to be dirty dies. cleaned it out and seems better. im using mp 200 powder.
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Old October 21, 2006, 08:04 PM   #7
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also you might try a carbide sized die.... my lee dies have a carbide insert in the resizing sie and the brass comes out looking it has been cleaned again....
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Old October 22, 2006, 06:46 AM   #8
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Posts: 2,019
Crank your die down to hit the shell holder, then raise it one quarter turn. You aren't going low enough on the cases.
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