How clean should brass be after tumbling for 2 hours? I just picked up a Lyman tumbler on EE and tried it out for first time. Around 80 once fired brass came pretty clean except for black 1/4 inch or so around the neck where the bullet seats. Should this have cleaned or did I not have it tumbling long enough? All new to me, haven't actually loaded anything yet, just trying it out while I'm waiting for the rest of my reloading equipment.