seating bullet

[ron755]

I bought a Hornady single stage press a few weeks ago. I'm using Lee dies. I started reloading 9mm ammo. I'm having trouble seating my bullet. After I get my seating depth set, it changes after a couple rounds. I have to keep resetting it. Is it my dies or am I doing something wrong?
Thanks in advance Ron

 

[Chuckdog]

Sounds like something's not snugged up. The Lee uses an O ring for friction on the seater insert. Make sure it's there.

Some bullets aren't uniform either. If it's a small amount, .002" or .003" I would check for bullet variations.

Rifle tips can vary .005" or more. Remember. most bullets aren't being seated by its tip, so o.a.l. may vary a bit with any of them.