Roger this . . .
The [so called] pressure-ring, is normally about 0.0003" to 0.0004" over the nominal bullet diameter, thus, even if the P-R could/did shear off, at best, would be only about 0.0002" 'THICK' - <1/10th the thickness of a human hair.
Residing in the fire-blast zone, its difficult to imagine that the ultra thin gilding metal wouldn't have been vaporized, and possibly deposit along the bore . . . ???? Surely, this is a weird one.RG
Is it possible when seating the core to apply enough force to stretch or weaken the jacket at the pressure ring/heal of the jacket? Maybe somebody threw a set-up bullet in the pot when they were made? Or maybe the punch when forming the jacket might have had too sharp of a corner?
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