Have you considered that you may be lengthening the cases when pulling them back over the expander ball of the sizing die during the downstroke after sizing?
Try sizing a case without the cecapping rod and expander ball installed as an easy check.
I'm curious, Welding Rod. How much fore and aft slop is there in the bolt body to receiver when the extractor and ejector is removed? If the hammer is able to drive the bolt and cartridge forward an unusual amount upon ignition, perhaps it would account for some of the overworking of your brass, resulting in unusually "blown forward" shoulders. (It would actually be a case of "blown rearward" case heads.)
No, but can lead to a really difficult to clear malfunction as the next case tries to feed. I suppose you could etch a ring in the chamber, but I've never heard of such.
There have been broken shell extracting tools made to clear brass remnants (including just case necks) that have been made over the years in all sorts of military calibers, from 45-70 on up.
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