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turning necks before or after fireforming

When you are going to fireform new brass in a dasher, would you turn the necks and shoulder before you fireform of after? I am wondering about forming a doughnut. This would be in a .270 neck but I turn my necks just a little usually to .012 or .0125. Any help appreciated.
 
Ive done it before, just havent got to fireforming yet. Mine is a 0.268 neck and rounds will be 0.264 loaded
 
I have made a set of cases both ways.
The set I turned after fireforming acquired the dreaded doughnut.
The set I turned before FF did not.
 

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