Just for perspective, keep in mind that about all of you would not give a second thought to touching off a modern high performance, high pressure pheasant or duck load in this gun.
Yet if you look at it, the engraved barrels have sharp stress risers right over the highest pressure area of the barrels. Some of you have even taken old Fox guns and had the barrels engraved similarly. A stress riser on the outside is far more likely to cause failure than one on the inside of a thick wall tube under pressure. I'm not saying the barrel above is prone to fail, but rather you should temper your concerns with the knowledge of that gun above and other old guns with engraved breaches. It shows that some depth of pitting, especially on the interior, is of little concern.