I size my brass to fit my chamber. The most economical and sensible way that I know of. You may be more advanced reloader riflesmith guru than me.
From what I have always seen that after firing, with the exception of when the brass is highly polished, the case has grown to fit the chamber. If it grows or even needs to grow more than .004 it is a bad thing. What you are talking about is foriegn to me but I may be the DA. Use since the size of your case right now is important to you just headspace to your brass. Take a piece of .003 shim stock or whatever you want to hold your chamber to and cut it out to fit the head using some grease to hold it in polace and try to close the bolt,
It is much easier to bump the shoulder each time you resize or use a neck sizer and body die when you need to but you can do it however you want.
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