What you have is the die is chambered too deep and base of die hits shell holder before shoulder of case is contacted. If you have a friend with a lathe have him whack about .015" off the bottom of the die and make sure to re-radius the die mouth like it is now.
The run die down leaving it about .012 off the shell holder and run case in, if you still get the line turn die about 1/8th turn at a time till you see that the shoulder is just touched.
I have about 60 sets of dies and I have had to trim about 15 of them to get them to size correctly.
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