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The X-Sizer Die is designed to help standardize cases and eliminate the need for repeated trimming. It looks like a regular Full Length Sizer Die but features a specially designed mandrel that has an expander ball and decapping pin attached. The mandrel is the key feature of the X-Die® because it reduces the growth rate of the case as it sizes due to the case mouth contacting the mandrel during sizing. This patented die requires only one initial trim of .020” off the maximum case length to standardize the case. The neck wall of the case does not thicken as the case length is pushed back because of the extremely close tolerance between the mandrel and die neck wall. Cases repeatedly sized in the X-Die will initially grow a few thousandths of an inch but will stabilize below the maximum case length with no discernable loss of accuracy or case life.