Originally Posted by ggibson511960

If one is tightening die lock nuts tight enough to need a wrench, it is a good idea to make sure the die is centered on the cartridge case. The thread fit between die and press is a running fit that can be wobbled. CoAx presses don't have the issue, but all other conventional "C" or turret presses do. It is a very good practice to tighten the lock nut with a cartridge case part way into the die to make sure the die is coaxial and centered. Fussy? Yes, but when I used to use a "C" press it made a difference on badly bulged brass (SMLE) with a lot of runout I was trying to get to feed again.