all good points above, but bottom line is ,IF it does occur in your gun ( and this does most revolvers, nature of the beast) what happens is this spot ( cut/area ,whatever you want to call it), after a short period of time, "spot anneals" itself, and this STOPS....makers have tried everything over the years, put in "inserts" separate heat treat to the area etc.,, but loaders, shooters and ammo makers come up with some "hot" stuff over and over...I would worry MORE about the "throat erosion" to the forcing cone that the "line" over the gap...which by the way often is ONLY fouling ,leading or the "blow by" of the gap in the revolvers between the cylinder face and the breach face of the barrel, and often will clean off.......