SAECO sizing dies are made with a unique prelead that fits the "as cast" bullet diameter for a depth of approximately .3 inches. This special entrance throat insures that the bullet feeds into the sizing diameter in absolute straight alignment. The constription between the two diameters is a gentle taper which eliminates lead shearing and sizes the bullet concentrically. The dies are finished by internal honing known as micro-finishing which produces a mirror like finish and a sizing hole that is perfectly round. your bullets will look like polished silver with no lead shavings.