Not sure what forum to put this question in...see picture
I am cleaning up my old 45-70 brass and ran across some that have a distinct band running around the brass case, does anyone know why this is?
I also have some cases that after running through the tumbler are still stained/discolored, while I'm not fanatical about my brass, I would like to clean them up as best as possible...any tips for removing the discoloration?