Another outside the box option:
Not always,but nearly so,if the range is far enough to need a rifle,its hard to claim self defense.
Not always,but nearly so,if you have to go retrieve your long gun,its already too late.
For true SD,the handgun that is on your person will do the most for you.
Take your pick for the optimum SD handgun,without regard for deer hunting.
In your saddlebag, a suitable T/C or other single shot handgun.Maybe 30-30.