RE: All in one guns?
If you want a .243 Win rifle, then get a .243 Win rifle. If you want a shotgun, get a shotgun...etc.
BTW, I've heard that the Rossi single shot rifles have TERRIBLE triggers. NEF/H&R Handi-Rifles are much better. If given the choice I'd spend a little more (apx $50) and get the Handi-Rifle.
Mike