Yes, so a search on MUNICODE.COM
for Gwinnett County ordinances
and City of Lilburn ordinances / codes also.
You'll need that to have a full picture of how "the law"
treats these scenarios of shooting in your backyard
or from the house into the yard.
BTW, this is one of those issues that the last person I would ask is a LEO. They have been told one black and white line which is probably wrong.
The ACC PD is notoriously deficient on the details of firearm law, state and local, and the UGA police know even less.