I was wondering what the most powerful round put into general service was. I'm not talking anything other than a shoulder fired rifle. No rifle grenades or RPG's. I'm thinking there was little to choose form between the 30-06, 8mm Mauser, 7.62x54r...even the .303 and 7.7 Japanese were awfully close...but which was top dog? Or was there a 19th century cartridge that dusted them all?