You can maybe, maybe, maybe this to death until we are all dead. You admitted it yourself it works if you don't make any mistakes. Just make sure its clean, completely dry and completely coated and there will be no problem. Natral lube is not for lazy people that want to clean up quick and throw the rifle in the closet till next year. It makes for all day shoots and great accuracy. I AM willing to spend some time with my rifle.
If the piece is not properly cleaned and not properly dried, then when you coat the bore you are basically trapping corrosive fouling and moisture between th lube and the walls of the barrel. This WILL cause lots of rust. Just get it clean, dry and lubed properly and it's great stuff.