Ruger-Redhawk,
The Atlanta-metro counties (Fulton, Gwinnett, Cobb) do not have a ban on hunting, they are just predominately bow-only.
In response to the question regarding hunting around Marietta, I would suggest looking for a club/lease in the following counties: Heard, Early, Meriweather, Troup, or Coweta. Meriweather, Troup, and Coweta are to the Southeast of Marietta and offer some great hunting. Depending on exact location, it would take you around 40 to an hour minutes to get to your location from Marietta. Troup and Coweta both have 4 points on a side or 15" inside spread rules for the entire county, so you have a number of mature deer. I hunt with a friend on a lease in Meriweather that offers phenomenal opportunities. There is usually at least on 155-160 class take each year, to go with numerous 140s. They have a tape of a deer from this past season that is easily B&C. However, most of the land in these counties are in clubs that are quite pricey.
Heard and Early counties are more due East of the Atlanta area and sit right on the Alabama border. These counties, while not quite as well-known as the previously mentioned ones, are beginning to offer some great hunting, at a more econonomical range. But again, there isn't much public land, most opportunities will be in clubs. As for time to get there, you would be looking at 30 to 45 minutes.
If you really want public land, I would recommend looking around Columbus or Macon. There are numerous opportunities aroun both of these cities, but they are both over an hour away.

I hope this helps!