Full-length die sets for bottleneck cases include two dies. The Full-Length (FL) resizing die contains a decapping rod assembly with a neck expander (size button), which resizes the case and removes the spent primer while ensuring proper neck tension for bullet seating. The seating die (ST) includes a bullet guide, a built-in crimp ring and the correct seating plug, allowing for precise bullet placement and a secure crimp. Together, these dies provide a complete solution for resizing and bullet seating, ensuring reliable and consistent reloading performance.