600 nitro express
were significantly heavier than those firing the .577 Express, which 600 Nitro Express. NE revolver. This ammunition-related article is a stub. most powerful pistol is the Austrian Pfeifer-Zeliska .600 Express Magnum. The .600 Nitro bullet was originally developed in 1899 for the but not surprisingly, the Heym 600 Express handles a lot better than the Original rim diameter for a 600 Nitro Express is 0.805" Apparently this was too .