I am going start neck sizing to get the most out of my brass. I will only be doing this for my 223 bolt gun, no autos or other guns.

I got recommendations to use a Redding body die to bump the shoulder back when needed.

I am probably messed up in my thinking but if I bump the shoulder back wouldn't it also FL size the brass body also at the same time? I do not want to work the brass more than I have to now. If I can get away with only neck sizing that would be great but I did notice some of the neck sized only brass was a little stiff to chamber but extracted easily.

If I am only going to be neck sizing for one bolt action is there still going to be a need to bump the shoulder from time to time?

If I do need a body die to bump the shoulder, which die should I get? (a link would be great)

Thanks
Dolomite