I usually go up to the Wilson Shoals WMA range up 85/985 a ways. About an hour from here (Lilburn as well). I've gone up to the WMA range at John's Mountain WMA I think it was called as well while visiting a buddy up that way. It's up 75 near-ish Rome. Somewhere inbetween these two is also another WMA range IIRC, but I haven't been there.
I like these WMA ranges since they are unsupervised, no snooty range officer to be annoying as they usually are or rules about "1 shot every 2 seconds" or other such crap. Can shoot at clay pigeons, empty ammo boxes, etc and other similar non glass/metal targets (as long as you clean up afterwards). More fun than a uptight range that only allows standard paper targets...