John-
I have not found FC brass to be as thin as you quoted.
I ran into problems with neck diameter.
My reamer measures 0.336" at the neck base and at the case mouth.
FC brass was running from about 0.330" at the case mouth up to about 0.337" at the base of the neck.
It's really just the "doughnut" that you have to watch for.
People who neck-turn will know of what I speak about...
Switching to RP brass has solved all these problems for me.
I am seeing 0.330" at the case mouth up to about 0.332" at the neck base.
Randall Rausch
www.ar15barrels.com
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