If you get less runout using a collet die, that means either your FL die is defective or your technique is wrong. Usually, it is a problem in the way which you set it up. There is absolutely no advantage to neck-sizing and many disadvantages.
Yessir. With threaded dies, a 50 cent rubber washer/'O' ring, a quality flat shell holder and a loosey-goosey sloppy press will fix a lot of problems. -Al
