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Hello, splatman. Just wondering..you said dies are new..did you first clean out any polishing compound the mfg. might have left in there before using?
What type case lube are you using? That sounds like pretty heavy (thick) brass..I normaly use Imperial wax, but for tough jobs..I have found nothing better than Corbin sizeing lube. It sounds like you might have brass sticking in there..look into die with strong light & magnification..if you see streaks of metal standing above surface..thats where your "lines" are coming from..chances are your dies aren't harmed..it's only metal torn from the previous case necks. carefully polish out with 400 or 600 grit wet or dry paper on a dowel & light oil, & clean-up with solvent.
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