No. Most definately not.
The unfired round will be made from brass that is smaller than SAAMI spec, ensuring it will fit in any chamber.
FLS will only take it back near to SAAMI, or on it, if you are lucky.
Brass work hardens, which is why we anneal the necks.
You can only push the webs back as far as the dies will allow, and sometimes that isn't enough to chamber the case.
Hi Baldy
Thanks for the help, I know you re an expert, just tried once fired FLS brass in new chamber and it fits without any resistance, so I reckon I had a bit of luck!
Regards
Redding