I get this question a lot and want to be perfectly clear, as just bringing attention to an industry failure has caused more concern than necessary. Somehow, folks are under the impression that a special seating die is required for the Flat Line bullets. This is 100% NOT TRUE! As I have always stated, and should go without saying, that when you change bullets, or anything component wise, you should be sure that the tools used on those components work properly. Thus, we suggest you check your seating stem to be sure that it is not damaging the ogive or that the bullet tip does not bottom out. If either are the case, we are happy to fix it for you, free of charge. You need only send us your seating stem. Let me repeat: You do not need a different seating die or something different for our bullets.