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Old January 10, 2013, 02:05 AM   #3
Ifishsum
Senior Member
 
Join Date: September 15, 2005
Location: Oregon
Posts: 699
I use fine polishing compound (JB paste) and tight fitting bore mop on a drill. My .223 FL die starts doing also that every few hundred rounds or so - I polish it up and the marks (light scratches basically) go away for a while but they seem to come back after a couple hundred more cases. I figure it must be a rough area in the die or something that collects a tiny bit of brass from each sized case until the scratches get noticeable.
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