Alright so I just got BTSnipers package with my core mold and de-rim die. I ran a half dozen or so clean 22lr cases with various headstamps through the die. Using two hands and standing to push the handle down with steady pressure it seemed to take quite a bit of force. On the sixth 22lr case I popped the wooden ball off my press handle (I'll just epoxy it back on). Does this sound right? I read and followed the de-rim instructions to the best of my ability and I would just like to make sure I am doing it right before I screw something up.
Additional details: I have a Lee classic cast "O" style press mounted to a solid reloading bench.