Gunner, HEAT, PC! offers detailed depictions of gunnery systems for a variety of vehicles and weapons.  Some of these require specific knowledge in order to use them to their full potential.  For convenience, we've assembled a list of all gunnery guides written for the game so far.  

M60A3 TTS

https://gunnerheatpc.com/news/articles/gunnery-guide-m60a3-tts

T-55A

https://gunnerheatpc.com/news/articles/gunnery-guide-t-55a

T-72M1

https://gunnerheatpc.com/news/articles/gunnery-guide-t-72m1

M1IP

https://gunnerheatpc.com/news/articles/gunnery-guide-m1ip

Happy hunting!