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2full turns after touching the shell holder, using a lee hand press
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That is the adjustment of the die but the second variable is how much force you put on the press handle. If you don't apply sufficient force, the neck will not be properly sized.
I use Lee collet dies on about every rifle caliber I load for. When I first receive the collet die I disassemble, clean and polish the mating surfaces then lube them. This greatly reduces friction, eliminates any galling, and improves the operation of the die. The die internals can come pretty ugly from the factory. Especially the cuts in the collet portion.
The only time I have found my set up didn't adequately size the case necks with the standard mandral is when they have been full sized numerous times and have work hardened. The brass is more elastic when it gets harder and springs back more. The solution for this is to anneal the case neck.
I use the Redding body dies to bump the shoulder back when necessary.
I understand this hasn't been your experience.