You can crimp with the bullet seating die in Lees sets but, it is recommended to do the crimp with the Factory crimp die. The Factory crimp die also sizes the round while crimping to be sure the round will chamber properly. I have only used Lees dies so I can"t say that RCBS is worse, same or better. I can say I have had great luck using Lee dies in the past and with my newer setup as well.
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