Picked up some fired range brass for 6c EA mixed head stamp. Noticed different knurled banding on the brass/nickel cases. What are the bands for and how do they affect the reloading of these cases? Some are where I would expect the base of bullet to be, some are far down the case where I would expect a flush wad cutter to be, but with 2 stripes. One knurled and one with sharp crimp in the case. Will post pic if needed. good to load?