I understand that the possibility of ring bulges exists in any barrels , particularly thinner barrels, if large diameter hard shot is used with tight chokes , regardless of the composition of the shot. I've seen ring bulges from lead and I'm sure they can occur with steel also.
I would not be surprised to learn that many Parker ring bulges resulted from lead buckshot loads.
Bursts and bulges can occur for all sorts of reasons not attributable to the composition of the shot material. I witnessed a barrel burst from a light lead RST load and I have also witnessed barrels not burst or ring bulge even when grossly overpressure loads were used. The issue to look into the issues in a careful and rational manner. I thought the Roster article was interesting, but each to his own.
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