Dillon recommends do not clean pistol brass too much because the progressive press bell funnel sticks and drags on clean case mouths/I like a little mica dust in a plastic bag filled with brass shake til a little mica is in the mouths/this is the exact same stuff you put inside rifle necks before size/any mica outside the case also lightens the press stroke a bit/mica does not foul powder so I use ballistic products mica dust wad slick/I roll the tiny amount of mica off the loaded brass in a towel shines like new