It is Lawful, under your circumstances, except Cobb County Ordinance 86-5(a).
This Law is Lawful under Georgia Firearms Preemption Law 16-11-173(e).
However, I am, too, aware of the Bill you speak of. The Bill was co-authored by Sean Jurguson, who is very Pro-Gun, and is in The General Assembly under HB 182.
Local Ordinances, authorized under 16-11-173(e),under this Bill, would not stand under 16-11-173(e1*), if passed, because; Discharge on properties of 5 acres of Land or more would be Lawful notwithstanding Local Discharge Laws, such as 86-5(a).
Discharge of a Firearm within 50 yards of a Roadis Illegal though under Georgia Code 16-11-103, or on another Property, less having their Permission, under Gerogia Code 16-11-104.
16-11-103 and 16-11-104 are both Misdemeanors.
However, neither of those Laws apply to Self-Defense, or Standing your Ground Laws, as are Codified under Gerogia Laws 16-3-21 through 16-3-24.2.