Thread: Fixing Run-out

A standard Hornady "New Dimension" size die. I just took 3 new Norma 6.5 cases, resized them to 6.0mm. They came out with an average of .04MM (0.0015 ??) runout on the neck. With projectiles seated using the conventional Redding die, the run-out on the projectile was 0.06mm for a Hornady 105, 0.04mm for a Nosler 100 and a whopping 0.14mm (thats 5.5 thou in imperial right??) for the Sierra 110. I'm seating everything a little bit, then turning 180 degrees for the final bit. Its gotta be something I'm doing . . . .

Originally Posted by Tentman

A standard Hornady "New Dimension" size die. I just took 3 new Norma 6.5 cases, resized them to 6.0mm. They came out with an average of .04MM (0.0015 ??) runout on the neck. With projectiles seated using the conventional Redding die, the run-out on the projectile was 0.06mm for a Hornady 105, 0.04mm for a Nosler 100 and a whopping 0.14mm (thats 5.5 thou in imperial right??) for the Sierra 110. I'm seating everything a little bit, then turning 180 degrees for the final bit. Its gotta be something I'm doing . . . .

Then ditch the Sierra 110. Close to zero run out in a factory chamber doesn't achieve any better accuracy over run out of .002" in my experience.