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My question is wouldn't the firing "stretch" the cases to form the chamber dimensions? And if too small(the chambers headspace) wouldn't there be indications of excessive pressure?
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Yes, the case should stretch to fit the chamber, no, not if the smith cut the chamber to Min specs. Meaning no room to stretch, a good thing.
Will a small chamber have an affect on pressure, no not if it is in the chamber, yes, if it is in the throat.