Yup.
Neck up to turning size (only because this was a tight necked chamber, less than 0.002" clearance)
Turn
Neck up to a larger size
Bushing size the neck back down
Anneal
Prime, powder, seat, shoot.
I said "a datum line", not in reference to the headspace comparator datum line size but in reference to an AI crushes at a point on the shoulder of the case based on the diameter of the chamber neck and where along the shoulder that full neck diameter of the chamber is reached, since the the neck has to have radial clearance for expansion. The false shoulder crush is fully in the neck of the chamber, not on the shoulder at all. I can chamber a false shoulder round and see where the neck/shoulder junction is in the chamber based on how much of the false shoulder gets jammed in. It's a visible bright ring around the false shoulder if you remove a case before firing.
This a 243 WIN with a false shoulder in a Sheridan Engineering slotted case gauge that shows where the false shoulder sits in relation to the neck shoulder junction. In an actual sectioned chamber the neck of the chamber would be wider, and sit further down the shoulder than this minimum spec gauge. This case is not inserted all the way by quite a bit because I wasn't going to hammer it in like an action could cam it into the chamber.
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