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The Dillon resizing dies have a tapered carbide ring that,in theory,allows for a smoother operation in progressive presses. IMHO,this is a recipe for the bulging that you're seeing,as the top of the ring is closer together than the bottom of the ring,creating a funnel for the case to ride into as it is resized. I went back to my Lyman resizing die in my 550b after seeing to same bulging in .45 Colt cases. Also,the Lyman just seems smoother during resizing.
Bill
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