Re: Wrinkly Brass???
If the case is bulged, you can feel/see a lump/bulge, the chamber is pooched. Get a chamber cast made and I think you will see that there is a bulge in the chamber.
If this case bulge is removed during FL sizing, in time that portion of the brass could weaken and crack leading to a case separation.
Only solution is to rechamber/rebarrel if this concerns you. Very rare in modern rifles, but common in WW surplus bolt guns.