The Ultra Micrometer Seater Die is a non-crimping style die (except for the 30-30) that ensures the bullet and case are held in perfect alignment during the press-fit seating process. This precise alignment guarantees consistent and accurate bullet seating every time. A built-in micrometer allows you to adjust the bullet seating depth to your exact specifications. Once you have seated the bullet close to the desired depth and measured it, simply adjust the micrometer stem up or down to the exact depth you need, ensuring the cartridge is the perfect length for your requirements.