I’M EXPECTING AN EARTH-SHATTERING KABOOM: Review: Big Horn Armory AR500. “Let’s start with the cartridge first. Big Horn basically takes a .500 S&W Mag. case, turns the rim so it becomes a rimless case, and then takes full advantage of a rifle-length barrel. It calls the cartridge the .500 Auto Max. . . . Who among us can complain about sub 2-MOA accuracy, with this power? Combine tack-driving accuracy with pile-driving power, and whatever you want to shoot will stay shot.”