Die sets for straight wall cases typically include three dies to ensure proper resizing and bullet fit. This is because it's not possible to full-length resize straight wall cases and expand the neck for proper bullet seating 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, which allows for the correct neck diameter to ensure proper bullet fit. Finally, the seating die (ST) includes a bullet guide, a built-in crimp ring and the appropriate seating plug, enabling precise bullet placement and crimping for secure bullet retention. These dies work together to ensure consistent, high-quality reloading results.