Thread: Newby wannabe reloader part 2

One of the videos I watched was for the same rcbs dies I have and that explained die set up (just kissing the shell holder for sizing /decapping die) and the second die for bullet seating so those seem to be simple enough to set up , even set up for crimping was explained so that shouldn't be a problem.... hopefully.
I was going to save one of my factory rounds unfired to use as a guide for overall length (?). I intend to use the same bullet weight...
It's the talk of shoulder measurements etc and neck tension that is confusing me a little as I thought that the full length resizing die sorted all that. Just checking brass length was required after sizing.
Obviously I have a lot to learn...