At some point the brass will work harden to the level that the case is a crunch fit to the chamber. And this is when the case will stick in the chamber on extraction.
I have never found any accuracy or function advantage to neck sizing only. To ensure proper sizing, I buy these cartridge headspace gages, this is a Wilson
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this is a Sheridan:
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and I full length size my cases, but using the gauge to measure how much I am sizing. I bump the shoulder back about 0.003" from the fully expanded,out of the chamber, length. You want clearance between the case and chamber before ignition so the case will retract from the chamber walls after ignition.