Yes you can do it either way.I have Lapua .308 primed brass that has not been sized. Can I remove decapping pin and size as normal or just load as is?
I would try chambering an unloaded round and if it chambers no need to work the brass even more. Might run an expander mandrel in the neck is all I would do
My typical method as well.As mentioned above run an expander in the necks @ .002 smaller than the bullet diameter and roll with it.