I used some auto-aiming turrets at my last build and there is some examples for copypaste:

For 45 degree elevation
clamp((TargetElevation + rate(TargetElevation)(((1000 * sin(asin((TargetDistance * 9.81)/(pow(1000, 2)))/2))/9.81) * 2)) + (asin(((TargetDistance + rate(TargetDistance)(((1000 * sin(asin((TargetDistance * 9.81)/(pow(1000, 2)))/2))/9.81) * 2))* 9.81)/(pow(1000, 2)))/2),-10,45)/45

For 180 degree rotation
(TargetHeading - Heading + rate(TargetHeading)*(((1000 * sin(asin((TargetDistance * 9.81)/(pow(1000, 2)))/2))/9.81) * 2))/180

These are not written by me I used mahardika's builds to get them