[Colonel]

Well it basically just takes practice to figure out the range. Make sure you watch the crosshairs to get a feel for how far the shell carries when the crosshair is in a certain position. The tanks come from the left first then the right and back again, etc. It shouldn;t take you long to get the pattern down pat. As soon as you see a tank fire a round at it and the adjust your elevation. (it didn't hurt that I still had a couple of rocket rounds left for when a tank got too close!) It seems like I remember that the tanks come into vies before they are in range. I used my first round as a marker and then let the tank move into that spot before firing again. Then just fire as fast as possible while slightly incresing the elevation.