Flame cutting can and will produce visible wear on a revolver. As others have said, it typically is noticed within the first several hundred rounds and stops after that. I have never heard of a revolver that suffered a failure from this.
The biggest uproar about this that I can recall was the Ruger SRM in .357 Maximum. Between the flame cutting non-issue and accelerated forcing cone wear it spelled the death of this revolver. I have one that is NIB and you can see minor flame cutting from the test firing that was performed at the factory. I would guess that testing was limited to 6 rounds but don't know that for a fact.
The biggest uproar about this that I can recall was the Ruger SRM in .357 Maximum. Between the flame cutting non-issue and accelerated forcing cone wear it spelled the death of this revolver. I have one that is NIB and you can see minor flame cutting from the test firing that was performed at the factory. I would guess that testing was limited to 6 rounds but don't know that for a fact.