Except that right sided bolt actions are much more common than left sided bolt actions. Does the game take into consideration handedness? Who knows, but if every single hunting rifle is left handed bolt, it doesn't make a lick of sense. Many of the gun stores I go to if you want a left handed gun, you have to order it because they don't even have any in stock.
Regardless, point being that if you are in the wasteland scavenging, the odds are much greater you find right handed bolt action guns than left. It would be nice if the game has both, but we don't know.