Trim a bottleneck case once, and never trim again with the X Die Small Base Die Set, which includes an X Die Sizer and Standard Seater Die. The sizer features a specially designed mandrel with an expander ball and decapping pin attached. The patented design eliminates the need for repeated trimming after an initial trim of .020 inch off the maximum length to standardize the case. The X Die doesn't shorten the length of the case: The mandrel reduces the growth caused by the case mouth contacting the mandrel during sizing. Because of an extremely close tolerance between the mandrel and die neck wall, the neck wall of the case does not thicken as the case length is pushed back. Cases repeatedly sized in the X-Die will initially grow a few thousandths of an inch, and then stabilize below the maximum case length with no discernable loss of accuracy or case life.
Note: Reloaders who already own a regular set of dies for the chosen caliber need only order the X-Die Small Base Sizer.
- Specially designed mandrel with an expander ball and decapping pin attached
- Doesn't shorten the length of the case
- Case neck wall does not thicken as the case length is pushed back
- Made in USA
FAQ
What's the difference between full-length sizing, neck sizing, and small-base sizing dies?
- Full-Length Sizing Dies: Resize the entire case to SAAMI minimum dimensions; best for reliability, semi-autos, or brass used in multiple rifles
- Neck Sizing Dies: Resize only the neck; reduces the chances of case head separation and can improve accuracy in bolt-action rifles fired in the same chamber
- Small-Base Dies: Resize slightly more than standard full length sizing dies; ideal for semi-autos or tight chambers where feeding reliability matters most
What is an RCBS X-Die?
- RCBS X‑Dies control case growth after an initial trim, dramatically reducing or even eliminating future trimming. They’re ideal for high‑volume rifle reloaders who want consistency with less prep time. You must trim once initially; after that, trimming is rarely needed.
More Questions? Refer to the RCBS Dies FAQ
- Manual:
- Download Manual
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
