I do not have a set of 243 AI dies but I have been using a 243AI neck sizing die.
What is the advantage of having a set of , say redding dies, over just the neck sizing die ?
what GL shooter is right. in my 243 ai, I use wilson neck and seating dies. However after several loadings some of my cases get too snug to fit in the chamber. I run them through a redding body die to push them back enough to load easily into the chamber.