Hornady 45 Auto PTX Powder Drop Expander - Powder Through Expanders (PTX) are designed to work in conjunction with the Case Activated Powder Drop. These Expanders eliminate the need for a separate case mouth expander die on the Lock-N-Load AP press, freeing up an extra station for a taper crimp die or powder cop. Expanders Work For Lead, Plated And Jacketed Bullets