This patented design quickly established itself as the “state of the art” in straight line bullet seaters and beat the concentricity problems inherent in all other seating dies of this type. Tighter manufacturing tolerances were made possible due to the details of the floating seating stem system. The bullet guide to seating stem fit is so precise that the seating stem can actually be demonstrated to float on a column of air. The seating stem is precision ground to exactly match the bullet diameter.