Originally Posted By: Recoil Rob
....Would a chamber cast be of any use?

It's just a thought, but if you're satisfied that there are no unusual pressure signs, I don't know if a cast would tell much more than the fired cases already do. If it were me, I'd try not to push the shoulder back much when sizing, but it has the look like the neck is going to get worked a good bit. Maybe it wouldn't be too bad a thought to anneal the neck area and watch case lengths a bit more than average reloading.