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Take the specs off a RESIZED case. The body of the reamer can be exactly to size.
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If you think that's what is needed to well align bullets with the bore, note that a .243 Win. cartridge whose body is .010" smaller in diameter than the chamber around it will perfectly align its neck and bullet with the bore in a .308 Win. chambered barrel.
Rimless bottleneck cases headspacing on their shoulder center up front by their shoulders mating perfectly with the chamber shoulder when the round' fired. Body clearance to the chamber walls is not an issue except the back end of the case gets pressed against the chamber wall by the extractor's pressure on the case.
Where does the shoulder on a .243/.308 Win. GO headspace gauge center when it's pushed full into the chamber and its body is smaller than the chamber body?