I used to have that "jump" until I figured out it was the Case Insert Slide and Slide Cam (part no. 97082) pushing the empty shell into the shell plate too soon. I adjusted the Camming Pin (part no. 13371) until the shell plate advanced and stopped and then the Cam would push the empty shell in. I have not tipped any bullets over or lost any powder since then. Read about it on here somewhere. Got rid of years of frustration.