That is why I never recomend a new loader start out on a progressive. I know this guy was not a newbie and that is my point. One false move with a progressive and you can get a bunch of messed up loads. Like a old reloader once asked me how fast do you really need to load ammo.
On my dillon 550B I have an RCBS powder cop die in station 3. I do this and each time I rotate the shell plate I look into the case. I stop ever ten rounds and check the powder on my scale. Never hurts to tripple check. It may just save your hands face and life one day.