8mm Shoulder Crushing

[mr.tickle]

Have some PPU 8mm Mauser brass I resized in a Redding die. Went to seat some Sierra 200gr HPBT in them and it keeps crushing the shoulder. I used the exact same dies and brass to seat Hornday 196gr with no issues last night. What am I doing wrong?

 

[ericuda]

https://www.thehighroad.org/index.php?posts/11518691/

Here ya go. Explains better than I could do.