Greetings @Philipo,
I suspect you are just not sizing the case enough. Wind the die down until the shell holder comes to a hard stop against the die and use decent lube made for the purpose. As you size the case you will feet the die contact the shoulder and you have to push through this until the die contacts the shell holder. You should not be able to see any gap between the two when viewed from the side. If there is you are not done sizing yet. The steep angle of the shoulder and its large diameter requires extra force to fully size.
Regards Grandpamac.
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