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You will not find a manual or a die manufacturer that says neck sizing for semi-auto's is safe. If I remember right, back in the 90's we had a guy that stopped in here and said he did it all the time. So that's one guy in several hundred.

Your smith would need a full set of headspace gages to give you a numerical measurement. I don't think it'd be all that useful; it changes over time and doesn't readily translate into what you should do with your fired brass.

Set your FL die with a case gage or comparator using the instructions.
 
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