I've been able to shoot ground targets from quite a distance away. I don't know the exact range but some of my Air to Ground missiles have race off into the distance to take out a target I didn't even know was there. I thought that a missiles range determined how far away you could strike a target. I thought I saw it in the CSWeapon.xml somewhere, when I was trying to increase the range of a canon (M102, 105mm Howitzer) for the AC-130 Spectre Gunship. Maybe Pete can confirm that.