Bought 100 new pieces of 7mm-08 brass, and began truing up the necks this evening. I'm cycling the press handle through it's full stroke, and noticed after about 30 pieces, brass was being deposited in streaks on the inside of the sizing die and those streaks are causing longitudinal scratches on my brass.

Do you think this is a poor quality die? For reference, it's an RCBS full length resizer (set it up and cleaned it yesterday before starting).

Thanks!