Full-length die sets for bottleneck cases consist of two dies. The Full-Length (FL) resizing die includes a decapping rod assembly with a neck expander (size button) to resize the case and decap the spent primer, ensuring the proper neck tension for bullet seating. The seating die (ST) features a bullet guide, built-in crimp ring and the correct seating plug, allowing for precise bullet placement and crimping. Together, these dies offer a complete solution for resizing and seating, ensuring reliable and accurate reloading performance.