Oh, Savannah
Grew up there, used to live there until 2005, and go back to visit family several times a year. My recommendation would be the DNR range off Kilkenny Road in Richmond Hill just to the south of Savannah. They may want a Hunter's Safety Cert or something to that effect now. Used to be free, like a lot of things, and I have heard that they may have gone back to being free over the past year.
Good range. Used to be one of those police your own type places.
Take Hwy 17 to Richmond Hill, turn left on GA 144 and take it for like 15-20 miles past Ft. McAllister. Look for a sign that says Kilkenny Road and turn left. Entrance to the range will be a dirt road on the left maybe a mile or two down the road. Good shooting!