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 design guarantees consistent, precise seating with every round. A built-in micrometer allows you to set the bullet seating depth to your exact specifications. Once you've seated the bullet close to the desired depth and measured it, simply adjust the micrometer stem up or down to fine-tune the depth. This ensures that each cartridge is seated to the exact length you need for reliable and accurate performance.