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If your dies are leaded steel (12L is common) than you need a undersize "die reamer"
If your dies are Stainless steel, than after reaming (with your chamber reamer) and hardening (RC-42) you need to have a layer of hard chrome plated to the inside of the die (about .0015 thick layer).
Contact both the main reamer makers (Manson, PTG) and Troy Newlon (IIRC Newlonprecision.com). Troy makes die blanks.
If your dies are Stainless steel, than after reaming (with your chamber reamer) and hardening (RC-42) you need to have a layer of hard chrome plated to the inside of the die (about .0015 thick layer).
Contact both the main reamer makers (Manson, PTG) and Troy Newlon (IIRC Newlonprecision.com). Troy makes die blanks.