The only gritty feeling case i ever had was the single time i tried one shot. I went back to wax for external sizing (hornady wax is fine). Dry lube for inside the necks so you dont need to clean it nack out or risk balling up the powder.
I do clean the dies once a year but thats just due to build up. Just a dab of the tinger tip is enough and it seems to take a knack to get that consistant. Add too much and you notice a it gathering at the neck shoulder joint. Go way over and it can dent the case. But ive deffinately measured variation in shoulder bump if ive not been sparing with it

