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Old February 13, 2013, 01:20 PM   #21
Join Date: March 4, 2005
Location: Ohio
Posts: 13,720
Yep. The brass spring-back from filling the chamber is uneven if the brass isn't dead perfectly symmetrical throughout (virtually never). So it's better to size enough to get clearance around the sides, and set the shoulder back just a thousandth or so to allow the taper of the shoulder to self-center the case neck in the chamber neck.
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