Haha, ask qaz for better help, but at short range, its fairly easy. Go to first person mode, and theres a better sight to shoot from. Theres some horizontal lines on the side of the sight. Line it up on the X axis, then use the lines to determine how high or low the shot should be. At short range, it works, but gravity comes into effect at longer ranges. Thats how i do it, but im not that good with a tank. Ask qaz, or if they return, pownage and green. Theyre the best tanks i know of.