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My opinion is you just have an oversized chamber.

OH, and to add to this. I just went down to put the brass I took the picture of back in the Remington box and decided to check the other brass.

1) The bulge is more prominent on one side of the all the fired brass. One side is worst, and opposite that side is almost flat.
2) Remington brass must be thinner/weaker, because this malady is worse on the Remington cases than it is on the Federal loads I tried. Both are basically ballistic twins based on the info on the side of the box. While we all know that pressure curves are different for different powders, I doubt there is much difference between the two.

All this leads me to believe it's an out of spec chamber. Makes me want to try harder to get the barrel off for a chamber inspection.

How does an oversize chamber occur?

Its in the manufacturing process but I can't tell you why it happens. I have noted a lot over the years in shooting Winchester levers in my earlier days.

My opinion is you just have an oversized chamber. If you look closely at the two cases you posted you will see the case diameter has increased during firing back to the point where the wall thickness increases at the base.

I also don't think any of the photos in this thread show signs of head separation other than the diagram of how to check for it.

With heads space problems on a rimless case the upper case and shoulder expand and hold to the chamber walls. The rear of the case moves back to the bolt face which causes the brass to stretch length ways. Wherever the brass is the thinnest you will see the beginning of a shiny ring which as it gets worse will appear to be stretching within the ring. See the diagram in the above posting.