The Ultra Micrometer Seater Die is a non-crimping style seater die (except for the 30-30) designed to maintain perfect alignment between the bullet and case as the bullet is press-fit seated. This ensures precise and consistent cartridge assembly. A built-in micrometer provides an easy way to adjust the bullet seating depth to your exact specifications. Once the bullet is seated close to the desired depth, simply measure it and adjust the micrometer stem up or down to achieve the perfect cartridge length. With this die, each round will be seated to the exact depth you need for optimal performance and accuracy.