How to recover a collapsed shoulder case

[Old Bob]

I've also crunched a shoulder or two when seating bullets, but not to the degree the OP did in his first pic. What I did was remove the neck sizing bushing from my L. E. Wilson die, apply a little case lube at the bulged section of the case & then run the still loaded cartridge slowly into the die. That squeezed the bulge right out of the case. Wiped the lube off the case & verified it would still fit in my Grendel cartridge gauge with the correct headspace.