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Old March 14, 2013, 04:20 PM   #6
Senior Member
Join Date: July 26, 2011
Location: USA
Posts: 1,529
Its because of bullet design. Light bullet is shorter than heavy bullets. SAAMI 2.815" minimum to 3.250" maximum COL. Seat the bullet base (full diameter of the bullet, not boatail) at the neck shoulder junction. See if that gives you a usable COL.
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