Ok, just throwing darts at this problem hoping for a bull eventually.

Thanks FM for helping out. I'll figure it out sooner or later.

Ok Tack Driver, one more stab at it. It sounds like the .002-.003 difference was there before you shot. The hard to chamber cases were already at a crush fit in your chamber. So either to many cycles between a shoulder bump or if you were neck sizing with an expander ball and the inside of the necks were not lubed, combined with nice soft brass after annealing, let the shoulder come with the expander ball a few thousandths on some of the cases. Or a combination of both. I think that was my last dart.

Pretty sure the whole batch was annealed and neck sized. I have not gone to fire them yet, but full sized them all and bumped .002", but maybe I have not annealed it hot enough to get it to 700 -750 degrees to properly anneal after 6 firings. The brass indexed about second right after the paint cleared up with the 650 degree Tempilaq, maybe it has not annealed them hot enough that some cases are still hardened and not properly annealed. Not sure. If I anneal them each firing and I will get the 700 degree Tempilaq to check to see if I am spot on. I may have indexed a tad too fast. Hopefully find out soon.