tudurgs, I was not implying that pressure is the issue where ring bulges are concerned. That has more to do with steel, especially in large sizes, not compressing well when it passes through a tightly constricted choke. Pressure, rather, is an issue for any gun with any type load: black powder, smokeless, lead, steel. Best to stay within the service pressure limits for which the gun was designed. Per Bell's tests, reported in DGJ, it's not likely that 1-2,000 psi in excess of service pressure max will result in a catastrophic failure. But it is certainly possible, perhaps even likely, that a regular diet of overpressure loads will result in a gun that shoots loose.
