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), which resizes the entire case while removing the spent primer and ensuring proper neck tension for bullet seating. The seating die (ST) contains a bullet guide, a built-in crimp ring and the proper seating plug, providing accurate bullet placement and a consistent crimp. These two dies work together to deliver precise resizing and seating for reliable and accurate reloading.