The Ultra Micrometer Seater Die is a non-crimping style die (except for the 30-30) designed to hold the bullet and case in perfect alignment while the bullet is press-fit seated. This ensures optimal precision and consistency throughout the process. A built-in micrometer allows for fine adjustments to the bullet seating depth, allowing you to match your exact specifications. After initially seating your bullet close to the desired depth, simply measure it and adjust the micrometer stem up or down to fine-tune the depth. This ensures each cartridge is seated to the exact length you need for superior accuracy and performance.