hillbilly you are about the 4th person to say that last comment. is there really that many out there?
If you're in an area that's got antelope there's generally gonna be enough to go around. A lot of times antelope are spotted from the truck then stalked. Now spooky antelope may take off when you slow down to look at them, depending how far off the road they are. The trick is to drive past them over the next hill and then sneak back to look at them (if your into that).
I actually prefer to hike away for the road, spot and hunt them all on foot. You're much more alone once you get out of sight of the road. The only nice thing is to be able to have access to drive in and pick up your dead antelope...especially if it's hot out (likely). I wouldn't use the cheapest bullets, just something workmanlike that your gun shoots well and is for hunting as opposed to some military discount plinking bullet.