It might be worth pointing out that the length of the loaded shell is not the length that matters. It is the length of the fired hull that matters. There is usually a greater difference in the two dimensions on star crimped shells than there is on roll crimped ones, IME.
Also, there is considerable difference between the overall lengths of unfired and fired shells between manufacturers, and loads. IOW, just because the box is marked "2 3/4" in no way means the shell inside opens up to exactly 2 3/4".
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