My RCBS 357 resizing die is scratching my brass. I have resized 200 357 NICKLE cases with the die, and that's when the problem started. The inside of the die looks smooth as silk, but evidently it ain't! How can I polish the scratches out? I thought about using 0000 steel wool wrapped around something in my drill to try to polish it out. Or just buy carbide sizing dies and start over. Any advice appreciated.