Zeb,
I neck size all my 'varmint' rifle loads. I use Lee Collet Dies exclusively. After several firings, you will notice the bolt begin to get stiff when chambering a round. You may at some point want to full length size, and then begin neck sizing again after that. Or, once they get stiff, just get new brass and save yourself the bother.
Lee Precision guarantees that their dies will produce great accuracy, or they will refund your money. Collet Dies are relatively cheap ($25 or less) and they work.
If accuracy is the name of the game, then you probably want to consider neck sizing.
Good Shooting.