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The X-Sizer Die is a unique tool that allows you to trim the case just once for standardization without requiring repeated trimming. It appears similar to a regular Full Length Sizer Die, but features a specially designed mandrel equipped with an expander ball and decapping pin. The mandrel is the key element of the X-Die. It works by reducing the growth rate of the case as it expands, instead of shortening its length. The X-Die only requires an initial trim of .020" off the maximum case length to standardize the case size. The mandrel's extremely close tolerance with the die neck wall ensures that the neck wall of the case does not thicken as the case length is pushed back, which will cause cases sized in the X-Die to grow marginally before stabilizing below the maximum case length. You can repeatedly use the X-Die without losing accuracy or the lifespan of the case.