Die sets for straight wall cases are comprised of three essential dies, each designed to perform a specific task, as it is not possible to both full-length resize and expand the neck for proper bullet fit in a single operation. The full-length (FL) resizing die includes a decapping rod assembly to remove the spent primer. The expander die (EXP) features a neck-expanding plug that ensures the case neck is correctly sized for bullet fit. The seating die (ST) incorporates a bullet guide, a built-in crimp ring and the correct seating plug to ensure precise bullet seating and a secure crimp. This three-die setup is crucial for achieving consistent and reliable reloading results with straight wall cases.