I think those eleven Burrard points to avoid barrel bursts are spot on, and repair decisions, regardless of value, are probably best left to experts who can make safety decisions.
For curiosity, I looked up CIP proof houses and by chance the Czech house came up. Sure enough there are two side by side gun blow up pictures. Yes, proof loads are over pressure, but the process appears highly controlled with documentation of the gun prior to the blow up.
Maybe, a citizen or organization of a CIP member nation could somehow or another request blow up analysis. Maybe, their data can point to trends of why blow up risks are missed after a gun passes safety inspection and measurements, and is tested with a control load that the gun can presumably handle. The reason I mention this line of thinking is because there would be documentation of no obstruction, and the possibility of where to look beyond a regular default position. Only thoughts.
