A less destructive way is to insert a feeler gauge of the required thickness under the case in the Shellholder- I.e. poke it in under the base. Works well and you don’t need to try and mess with hardened dies. Likewise if you want to back the die off, a feeler gauge between the base of the die and Shellholder to set your distance, then you can always reset it without buggering around.
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