I was told by a friend that he had bought a used Dillion progressive outfit and he had problems seating bullets because cases would have 2 or 3 thousands of an inch in length variation. He went on to say that one bullet just fell out of the case spilling powder so he didn't use the press any more. Sounded like to me he just wasn't seating them deep enough but OAL should have been to long to chamber if a bullet fell out.
Any thoughts on his problem.