Effect of Increase in Starting Pressure on Efficiency and Velocity of Caliber 0.30 Weapons

' The effect of increasing the initial pressure is studied theoretically. No improvement in muzzle velocity of a caliber 0.30 gun is found. Under some circumstances, the efficiency may be improved, but only at the expense of muzzle velocity. 1. AUTHORITY; This study was authorized by letter 0.0. 471/1464. 2» OBJECT; The object of the present report is to determine the theoretical effect on muzzle velocity and efficiency of small arms, of increasing the starting pressure by crimping the cartridge case into the cannelure. A specific example will be given for the caliber 0.30 Gun M1903, firing the Bullet, Ball M2. 3. GENERAL DIFFERENTIAL EQUATION; The interior ballistics will be determined by means of Edmund Röggla's differential equation; *n* s B^(n)'n Y n n (1) n """"""" * "Neue Diagramme für die Angewandte Innere Ballistik, Theorie und Beispiele", Edmund Rbggla, Pilsen (1930).