Breechplug, you would be wrong if think Stainless can not be oxidized. You would also wrong if you think its not different than carbon steel for corrosion resistance. A rifle manufacturer isn't going to tell you that you don't have to care for your rifle because if that were the case people wouldn't and the slightest rust and people would demand replacement.

If you read my comment thoroughly you would understand that it doesn't conflict in any way with what that manufacture said. All metal corrodes with use. To be corrosion resistant does not mean that corrosion doesn't or can't happen. So in the case of my rifle do I suppose absolutely no corrosion took place? No ... but then I looked for evidence of it. For example, I looked for rust on the cleaning patches, discoloration of the bore and pitting. Whatever corrosion may have happened is not visible and I can tell you that I inspected it closely. Last night I tried to photograph the bore but I just could not do it with my camera.

If you are suggesting that I am lying ... well you are simply wrong. I think the biggest risk with stainless steel is moisture not the powder itself. You could put my experience to test on your rifle. Just pick an inconspicous place on the exterior of your barrel, take some real blackpowder and put a little pile there. Then ignite it and leave the residue there for a year. When you go about to clean it off report your experience here. Whether you observed any rust or pitting and whether the residue had been in contact with water.