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If I have shot a new round in my gun and have now fireformed the case to my guns breech do I still need to worry about headspace? Or is the headspace now set for my gun? These newly fired cases are going to be worked on a neck sizing die only....
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As above (if you are firing a bolt action), the case is now custom fire-formed to the chamber's headspace dimensions. Necksizing at this point will preserve those custom dimensions, although the case brass will
very gradually flow forward after repeated firings to require you set the shoulder back again.
You'll know 'when' as the loaded cases will give you more & more "feel" on closing. When that feel gets
truly noticeable, resize again.