Full-length die sets for bottleneck cases include two key components. The Full-Length (FL) resizing die features a decapping rod assembly with a neck expander (size button), which resizes the entire case and decaps the primer while ensuring the neck is properly sized for bullet seating. The seating die (ST) is designed with a bullet guide, a built-in crimp ring and the correct seating plug, allowing for precise bullet placement and reliable crimping to secure the bullet in the case. These dies work together to ensure accurate resizing and bullet seating for optimal reloading performance.