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A taper crimp should only remove the belling made by the expander. So the final outside diameter should equal the bullet diameter plus twice the case thickness.
Ex: if you're using .401" dia bullets and .010 thick brass, the final diameter at the case mouth should be .401 + (2 X .010)= .421"
Overcrimping does not increase neck tension...it only distorts the brass and/or bullet.