I don't bother to resize before tumbling as the media really doesn't do much for cleaning the flashhole anyway. Secondly, the cleaner your brass is, the easier and better it will size in your dies. However, I do take the polished cases and pour them out in an old Tee shirt and give them a good roll-around to clean the dust etc from tumbling off them. Then I lube and size with spray on lube. After the finished round is done, I wipe all again with Tee shirt. Ammo looks and feels like new for a long time, or a couple of firings anyway...whichever occurs first.