Latest update - I sent the die to Redding (with the carbide ball installed, and with several neck-sorted, fired cases from my rifle) and they checked it out. They concluded the expander stem was crooked, replaced it, tested it and found it was making nice, straight cases. (They sent the cases back to prove it.)
But when I tried it for myself, I got the same runout as before. Now I'm really stumped. Clearly I'm doing something wrong, or at least different from what Redding did. But I'm not doing anything different with these dies than I do with any other dies, with perfectly OK results. Same press, same shellholders, same neck brush, same case lube.
Out of sheer curiosity, I also bought a Redding neck die, which gave about the same runout as the FL die.
Work has been crazy so I haven't had time to call them back, but does anyone have any possible theory that might explain this, just so I have something to kick around on the phone when I do have time to call?
Last edited by John Frazer; 11/06/11. Reason: Grammar.
