I always tumble it after resizing, to get all of the sizing goo off. That stuff is a magnet for grit and crap. If I used the spray dry lube, I didn't have to do that. But when I was running thousands of rounds of .223 reloads a year, I wanted the cases as clean as possible, to ensure proper functioning in the AR. I was loading in grups of 100 or so cases, and this was more time effective than just wiping the cases. I imagine, if loading in groups of twenty or forty, wiping with Windex would be quicker. A criminally cheap buddy of mine would buy this nasty horrible looking .223 and 7.62 ammo; all corroded up exterior, live ammo. I guess it was stuff salvaged from sunken ships. He built a homemade tumbler out of a truck wheel and washing machine motor. He would tumble LIVE ammo, to clean it up so it would chamber reasonably often. At least he had the sense to set the apparatus up back behind his shop, in case one of the rounds would let go. I shiver to think of it. When I shot competitively, I grouped my ammo into 100 round groups. I would anneal every second or third firing. When my group got down to 88 rounds, having lost 12 to split necks, I would dump the rest into my "creek bank," ammo stash. These I would reload with a standard 55 gr. cheap FMJ, and these I would use when taking people out to the farm to let them blast, and hopefully entice them into becoming a firearms owner. I would still pick up the brass, but would not cry if I lost any. MM