GS, I just used the Dillon dies with no special attention other than normal cycling through my 650. Haven't had any problems with loose bullets yet. I use W/W 230gr FMJ. with the same die settings as the brass. What dies do you use? I've had your problem with Lyman carbide dies in .45LC. I think the Wolf steel cases can be a little iffier on specs and elasticity than brass.