I selected 7.62x54R myself......dirt cheap, even the better Czecho silvertipped stuff, and the acid primers make you clean your weapon, but it keeps "forever". Long arms with good reach in that, plus a semiauto shotgun with an eight-round magazine for close in, and some compact, lightweight sidearms .... I can arm several of my neighbors, or carry a New York reload or two myself.
And Barrett Arms is about 24 miles down the road.