Effect of Lateral Tilt of Gun Face on External Ballistics and Correction Methods

Abstract

When shooters have an unconscious habit of shooting sideways or require to operate the gun face sideways for shooting due to the constraints of the terrain environment at the time of the mission,the aiming line will remain unchanged,and the muzzle will deflect around the aiming line. It will lead to the change of the spatial position of the muzzle to take the aiming line as the reference and thereby lead to the deflection of the impact point due to the change of the vertical and horizontal surfaces of the ballistics. In order to determine the mounting method of the scope while the gun face tilting sideways,a 7.62 mm high-precision sniper rifle were taken as the research object,and the spatial modeling function of the 3D design software was used,and the firing data coordinate system was established. The geometric method was used to analyze the influence of the muzzle tilt on the external ballistics and the distribution law of the point-of-impact deviation,and the formula for calculating the point-of-impact deviation was deduced while the gun face tilting sideways. Besides,the ballistic correction method was studied,and the set of equations for calculating the ballistic correction amount was proposed,and the precautions and training points for the shooter were pointed out. A test of point-of-impact deviation and ballistic correction was designed and conducted when the gun face tilted sideways at a 100 m shooting distance,and the results were analyzed. The study provides a ballistic calibration reference for a type of 7.62 mm high-precision sniper rifle to be used in combat shooting while the gun face tilting sideways,and it also provides a new test method for measuring projectile deflection flow.