I have the Lee Deluxe die set. it comes with the neck sizer, full length sizer and seating die. when the brass is new or starts to stick in the action I full length size. after that and fire the round it is called fire formed. this makes the brass match your barrel. then you can neck size. I neck size brass 5 or 6 times before I have to full length size. I dont crimp for my bolt gun, but in a Ar I would buy a crimp die and full length size all the time. Once you fire form brass only use it in that rifle..
Pete
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