Just purchased a Partner press and can't seem to get something right. If I size new cases they are fine. When I size (neck size only) a previously fired case, they crumble. I'm using the same Lee die and adjusting it the same. BTW, I was previously using a Lee Challenger press. Any suggestions? Thanks

http://i17.photobucket.com/albums/b54/coyotehunter223/DSCN0569.jpg

You're pushing the shoulder back too far...try sizing less of the neck

Thank you once again Steve....