Trim your bottleneck cases just once and never trim again with the X Die Small Base Sizer. Featuring a specially designed mandrel with an expander ball and decapping pin, this tool offers a patented design that eliminates the need for repeated trimming after an initial .020 inches trim off the maximum case length. The X Die doesn't shorten the case rather, the mandrel prevents excessive growth by reducing contact between the case mouth and mandrel during sizing. Thanks to the precise tolerance between the mandrel and die neck wall, the case neck remains consistent and doesn't thicken as the case length is resized. Over time, cases sized with the X Die may experience a slight growth, but this will stabilize below the maximum case length, with no noticeable loss of accuracy or case life. The X Die Small Base Sizer offers reliable, long-lasting performance and ensures a more efficient reloading process without the hassle of frequent trimming.