Winning the shadowrun 'who can have the most expensive ammunition' contest
Current answer is that one can get an injector-tipped arrow, rated for the maximum strength you can get a bow to in the game, and fit it with guidance fins so your arrow knows where it is because it knows where it isn't, and the whole shebang costs almost 350 nuyen, nearly as much as ten 20mm cannon shells, or a quarter of a month's rent per shot
But boy howdy is it sure going to kill you dead if you get hit by it
