Depending upon whether the gun is mounted to the submarine directly, or to the conning tower, there is a node associated with that gun mount, which is linked in the sim file of the same name, that controls the rotation and elevation of a gun mount. However, there is also a gun dat and sim file that the gun is in and that does similar. It is difficult to say what you have, and it might be that you have to find the node and the gun, and adjust both of them...
