BIG GUN, BIG NEWS. Smith & Wesson caused quite a stir when it unveiled its Model 500 five-shot revolver chambered for the new Smith & Wesson .500 Magnum cartridge. Anti-gun groups denounced the handgun as too powerful; it fires a round producing about three times the muzzle energy of a .44 magnum. Orlando-based TV crews scrambled to get pictures of it on the network feeds, even though area law-enforcement officials told them the 4.5-pound hunting firearm, introduced at the February SHOT Show, was hardly the sort of thing criminals would tote around. Then, Illinois Congressman Danny Davis made the curious observation that no one hunts deer with a handgun.