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Gerry,
SAMMI spec is actually a range, not a number. Figures listed on the diagram are maximum values. Side note reads: Unless otherwise noted body dia. -.007 (0.18). I will agree that the mouth of the case is under-sized to allow for case-neck tension to hold the bullet. But once a bullet is seated, the case walls are pushed out to fall within range. The SAMMI spec is for a loaded round, not a sized case.
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