I wonder if the main gun used in the revolutionary war was really the Brown Bess Rifle. I found out that the main gun used in the revolutionary war really the Brown Bess Rifle. The brown Bes Rifle is a gun that was the main firearm of the British Army. The Brown Bess is a 74 caliber,and it shoots a round ball that goes down the barrel. The Brown Bess is not acuuarate at all that why all the soldiers were lined up in a line and shot at onece so when they shot they would have a better chance of hitting the opponent.