Starline reloading components are custom designed and manufactured to precise specifications in order to deliver specific on target performance. These high quality brass cases are unprimed and in general do not require resizing prior to loading. Due to variances in diameter of different bullet types, it is a good practice to size the case only as far down as the bullet seating depth. When full length sizing is required, it will be noted in the box with the brass. Pick up some of these high quality brass cases today for your next reloading session.