Straighten the case mouth by inserting it partly in to the sizer die and allowing the expander ball to straighten the brass. Make sure you lubricate the case neck Within the circumstance mouth to keep it from stretching. Hornady Tailor made entire length sizing die designed resizing lubed circumstances easy, https://17-hornet-brass-in-stock12345.blogsidea.com/32674649/17-hornet-brass-an-overview