Norma Ecostrike 30-06 Springfield 165grIn 1903 the United States introduced the most powerful military cartridge in the world for use in the Springfield model 1903 rifle. Three years later some minor adjustments were made including the introduction of a lighter and more streamlined bullet and the new standard military cartridge was accordingly baptized . 30 06 Springfield. This is easily the most widespread hunting cartridge in the world although it has been pressed hard by the . 308 in