What I have personally found about runout is it has a lot to do with brass hardness and bullet seating.I can start with new or once fired brass that starts out near zero runout and around three or four times the brass has been fired and resized,I'll start seeing more runout.I can anneal that same brass and the runout is reduced.If you have a bunch of cases that are a mixture of number of times fired,you will probably see your runout all over the place.The best thing I've found is to keep your brass segregated by the number of times fired.If you start seeing a lot of runout,anneal it.I think a lot of the runout tends to happen when seating the bullet in brass that has harden to the point it has too much neck tension.