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Well......yes..... (now, I might show some ignorance)...but, I thought that as soon as the light goes on inside the case and the bullet gets thumped in the ****, that the annealed case wall has little choice but to expand out to the chamber dimension. I don't think sizing the brass at the mouth would do anything to save the bullet from making that 0.002" step transition.
You may be entirely correct. I can't claim to know exactly how things happen in there. But, I have yet to read a 'sequence of events' from a credible writer (one who claims to actually know) which describes the progression in detail.
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Yep, I can get at least 80.
But I want more, more, more so I can achieve that magical amount of powder and compression that finds me the Holy Grail - a clean burn.
Well, you could work if from this end...