I've been doing the same thing as the OP, processing .308 brass (trimming, decrimping, etc.). While doing this, my mind wanders. I also shoot traditional muzzleloaders and from time to time think about how, by the time you actually factor in all the time spent processing and reloading modern center fire ammunition (tumbling, resizing, trimming, de priming, re-priming, de-burring, powder measuring, bullet seating, etc., etc., etc....) how much less total time is spent per shot shooting and reloading a flintlock (measure and pour powder, seat ball, prime and fire).
Just a curious thing.