I had a similar problem with a .243 sizing die a few months ago. I took the shell holder, locked it up in the vice & ground about .010" off it so the die would come down further. After a few months of needing the "special" shell holder (and losing it once in a while) I sent the die back to Lee Precision & they cut the bottom of the die.
By the way, the shell holder is some pretty hard stuff so of you decide to grind it, take your time & grind slowly. You can dress it up with a file to make it smooth if necessary...
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