Neck sizing with a FL die works pretty well for calibers where the case has a fair amount of body taper - like the 30-06 or .270. You resize only about 3/4 of the neck, so the body and particularly the shoulder of the case aren't resized by the die. Also, resizing only a portion of the neck allows the part of the neck you didn't resize to align very precisely with the neck of the chamber - and gets things lined up pretty straight. After two or three reloadings, the bolt will close hard and you will need to FL resize the case - but only just enough to get the bolt to close without effort.

Having said that, I would buy a three die set from Redding. Another economical alternative is get the collet dies from Lee, which have a neck sizer and a seater, and then purchase a Redding body die to bump the shoulder back as necessary.