Full-length die sets for bottleneck cases contain two essential dies. The Full-Length (FL) resizing die features 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, built-in crimp ring and the correct seating plug, providing precise bullet placement and a secure crimp. These dies work together to offer consistent, reliable resizing and bullet seating, ensuring optimal performance and accuracy in your reloading process.