Lee Micrometer Precision Bullet Seater Features Seating depth is one of the few reloading variables a handloader can change in thousandths and measure on target which is why the Lee Micrometer Precision Bullet Seater puts a laser engraved micrometer thimble and body on the adjustment. The divisions read just like a precision depth micrometer each one representing a single thousandth of an inch so working up a seating depth ladder is a matter of counting clicks rather than guessing at lock ring turns and re-measuring every round. The adjustment is infinitely variable meaning a load can be tuned to the exact distance off the lands that a given rifle and bullet prefer and then returned to that setting later without a re-work session. For the .280 Rem and .280 AI handloader chasing the last fraction of a minute of angle that repeatability is the entire reason to buy a micrometer seater instead of a standard one. Concentricity is the die s other job and Lee addresses it with a floating bullet guide that holds the case mouth and the bullet in perfect alignment as the ram comes up. The guide is fitted with radial clearance so the case and guide can self-center against the seater screw rather than forcing the bullet in at a slight angle and Lee s testing shows this sliding-guide arrangement produces the least bullet runout. The seating stem itself is machined and burnished so it will seat nearly any point style from soft-point hunting bullets to fragile polymer tips and long boat tail match projectiles without marking or deforming the meplat. The guide is also reversible: unthread it re-install it and the die seats and crimps in a single stroke a feature exclusive to Lee. For reloaders who want one die that can run precision match loads and crimped hunting ammunition on the same press the Lee Micrometer Precision Bullet Seater is available for sale at GrabAGun. Lee Micrometer Precision Bullet Seater Die Specifications Brand: Lee Type: Micrometer Precision Bullet Seater Die Type: Seating Die Reloading Caliber: .280 Rem / .280 AI Bullet Diameter: .284 Adjustment: Laser Engraved Micrometer One Thousandth of an Inch Divisions Bullet Guide: Floating and Reversible for Seat and Crimp Available At: GrabAGun