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First thing that comes to mind is the crimp. With that particular load (I used the same for awhile too) a heavy crimp gave me very consistent results. A light crimp gave inconsistent results.
Regarding the C.O.L. Are you seating the bullet out a ways to get a particular C.O.L.? Past the crimp groove? That could be a problem too. Seat the bullet in the case and crimp the bullet in the groove the bullet has. A heavy roll crimp by the way.
Your primer is a good one. No problems there.
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