I'm using Lee full length resizing die for my 223 reloading.
After about a thousand resizing, I noticed these prominent vertical scratches around the neck. I review my previous resizes, these did exist but not as numerous and prominent as they are now.
What are causing these?
Some of the 'remedies' that I tried are :
1. As I had a few bouts of stuck cases, I suspected that the decapping pin may had cause this pressure, so I polished the it.
2. I had (nylon-)brushed and swabbed (polished) the inner of the die.
...yet the problem scratches persist.
Any suggestions?
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