I just purchased a new forster 308 win full length die. I followed the directions for set up the same way my 8 other Forster dies are set up.I lubed up and the first case got stuck. I removed it and cleaned everything up and went through the set up again. I again lubed up and the second case stuck followed by the third. I am full length sizing Remington once fired brass.I then took out my old Rcbs 308 win die and the brass sized flawlessly.When i removed the stuck cases i noticed a donut at the bottom of the neck. I feel that the neck diameter is too tight not allowing the expander ball to pull out.Any input would be GREATLY appriecated.