Lyman H & I Sizing Die .358 Diameter – 2766493 If you cast your own bullets, then this tool allows the reloader to bring the bullet down to size and apply lubrication. Lyman improved sizing dies now have 90° hole spacing for easier bullet lubrication, even with today’s hard lubricants. Lyman sizing dies also feature a tapered mouth and hardened interior insuring alignment for perfect cylindrical shape. Interior dimensions correspond to suggested diameters for all popular rifle and pistol calibers. (These are interchangeable with RCBS)