I ran into that problem with an oddball bullet fom a mold with no maker's name. Bullet was an RNFP but the punches I had for that type bullet would not fit. I took a spare top punch and carefully filed the cup part off so the the portion that pushed on the bullet eas perfectly flat. Worked like charm for that bullet. Just be sure the bullet is perfectly square on the luber/sizer before running it though the die.
Paul B.

Our forefathers did not politely protest the British.They did not vote them out of office, nor did they impeach the king,march on the capitol or ask permission for their rights. ----------------They just shot them.
MOLON LABE