Rcbs X Die Full Length Set .308 Win
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The RCBS X Die Full Length Set for .308 Win solves one of reloading's most frustrating problems: case trimming. If you've spent hours chasing case growth with trim dies and calipers, this set offers a smarter approach. The X-Die uses a patented mandrel design that controls how much your cases grow during the sizing process, allowing you to trim once at the start and virtually eliminate the need to trim again—a genuine time-saver for high-volume .308 Win reloaders.
Here's how it works: inside the full-length sizer die sits a specially engineered mandrel with an integrated expander ball and decapping pin. As you size your cases, the mandrel rides inside the case neck with extremely tight tolerances. This close fit means the neck wall doesn't thicken as the case is pushed back during sizing, which is the root cause of case growth in standard dies. Your cases will still grow slightly at first, but they'll stabilize well below maximum length and stay there, reload after reload.
The workflow is straightforward: trim your cases down .020" from maximum length to standardize them, then load with the X-Die set. Cases sized in this die grow only a few thousandths initially before leveling off—nothing that will affect accuracy or case longevity. You get the consistency that precision reloading demands without the constant maintenance that full-length sizing normally requires. For anyone working up loads for a .308 rifle, whether for hunting, competition, or the range, the X-Die set is a genuine upgrade to your bench routine.
Key Features
- Patented X-Sizer mandrel design reduces case growth significantly after initial trim
- Trim only once at the start; minimal trimming needed afterward
- Integrated expander ball and decapping pin for complete sizing in one stroke
- Extremely close mandrel-to-die tolerances prevent neck wall thickening
- Cases stabilize below maximum length with no discernible loss of accuracy or case life
- Designed for .308 Winchester full-length reloading
Specifications
| Caliber | .308 Winchester |
| Type | Full Length Sizer Die Set with X-Die Technology |
| Brand | RCBS |
| Key Component | Patented X-Sizer Die with mandrel, expander ball, and decapping pin |
| Initial Case Trim Requirement | .020" off maximum case length |
| Subsequent Growth | Stabilizes after initial growth of a few thousandths of an inch |
Frequently Asked Questions
Will I need to trim my .308 cases every reload with the X-Die?
No. Trim your cases down .020" from maximum length initially to standardize them. After that, cases sized with the X-Die grow only slightly before stabilizing well below maximum length, eliminating the need for repeated trimming on subsequent reloads.
Does the X-Die reduce the accuracy or lifespan of my brass?
No. Cases sized repeatedly in the X-Die show no discernible loss of accuracy or case life, even as they go through multiple reloading cycles.
What comes in the RCBS X Die Full Length Set for .308 Win?
The set includes the full-length X-Sizer die with the patented mandrel, integrated expander ball, and decapping pin. This gives you everything needed for complete sizing and decapping in one stroke.
How does the X-Die mandrel actually control case growth?
The mandrel inside the die has extremely tight tolerances with the case neck. As the case is sized and pushed back, the mandrel rides inside the neck without allowing the neck wall to thicken—the primary cause of case growth. This precision fit keeps growth minimal and stable across reloading cycles.
