The Ultra Micrometer Seater Die for .308 Winchester is a top notch die for reloading match grade ammunition. The Seater die holds the bullet and the cartridge case in perfect alignment while the bullet is press-fit seated. The Micrometer top on the Ultra Micrometer Seater Die for .308 Winchester allows you to very precisely set the depth of the bullet at .0005 increments to ensure proper “jump” to the lands for your specific barrel.