Broken line - the thread seems to wonder off your question. You need to use a case gauge to make sure that your sizing die is set properly. If your chamber is a bit oversized you will need to full length size fired rounds. The shoulder needs to be in specs, if it isn't your bolt won't close or be hard to close. Bullet seating should be first done with no crimp. Insert primed, powdered shell in case holder rise it up then screw in seating die until it touches the case. lower the case, turn out die 1/4 turn so no crimp is applied, making sure the seating stem is turned out so that it will not touch the bullet when put in the case. Put bullet on case, raise it up in the die and turn down the seating stem to set the bullet to the proper depth and COAL you are looking for. Once everything is the way you want it you are done. If you want to crimp the case, raise the stem and turn the die down to apply the crimp. One of these shells can be used in MtnCreeks's method listed above. I personally like to seat and crimp in two separate operations, but if you want to do it all at once, with a crimped finished shell in the up position, just run your seating stem down and lock all the rings. But in any case, invest in a case gauge.