[Brian Pfleuger]

I've been involved in this thread from the beginning and am quite familiar with the opinions offered.

It's a process of elimination.

How many causes are there for sticky extraction/bolt lift? More than one? Yes.

How many of those causes ALSO occur with things like primers being blown out of the pocket and the other symptoms you've listed?

I know of one. High pressure.

I don't know why. I'm not saying it IS your scale, I'm just putting out a "I don't know the cause" list.

Maybe your brass is low capacity AND your bore is slightly tight AND your powder lot is on the hot side AND the bullets are slightly over sized AND your scale weighs slightly heavy. All of it together adds to unexpected pressure.

I do know that some of your symptoms, individually, MIGHT have other causes but ALL of your symptoms, individually and together, occur with high-pressure.