Hornady Powder Through Expander.500 Case Activated Powder DropPowder 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. The Expanders work for lead, plated and jacketed bullets.