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The X-Sizer Die is a Full Length Sizer Die with a specially designed mandrel that has an expander ball and decapping pin attached to it. This mandrel is the key feature of the X-Die®. The patented X-Sizer Die ensures that the cases don't need repeated trimming after initially trimming .020” off the maximum length to standardize them. The X-Die doesn't shorten the case length but reduces the growth rate of the case as it grows due to the contact of the case mouth with the mandrel during sizing. The neck wall of the case doesn't thicken as the case length is pushed back due to the extremely close tolerance between the mandrel and die neck wall. Cases sized repeatedly in the X-Die grow initially by a few thousandths of an inch, and then stabilize below the maximum case length with no loss of accuracy or case life, making the trim of the case a one-time process.