Nah, a shotgun has very short range, any guy with a longbow could take him out from a distance that the shotgun won't reach. Now, a Snipers Rifle, or at the very least, a machine gun, that would make someone quite powerful in the medieval age ^^ Still not godlike though, gotta sleep sometime and eventually someone's going to get away that got a good look at your face, and then they'll send assassins to kill you. The deathnote made Light near godlike because no-one had a clue who was doing it all the way up until he got way to cocky and way to stupid.