Full-length die sets for bottleneck cases consist of two essential dies. The Full-Length (FL) resizing die features a decapping rod assembly with a neck expander (size button), which resizes the entire case while ensuring proper neck tension for bullet seating and removing the spent primer. The seating die (ST) includes a bullet guide, a built-in crimp ring and the correct seating plug, providing precise bullet placement and consistent crimping. Together, these dies ensure reliable resizing and accurate bullet seating, essential for optimal reloading performance.