From my understanding, if you had taken the rifle to a local Georgia licensee/FFL, and the FFL then entered it into his/her A&D book as an Acquisition, the FFL could then have transferred it to the out of state resident (as a Disposition), and the out of state resident could then carry it across the state line. Long gun only; handgun not allowed. Again, this is what I understand to be true and within ATF guidelines.
This is my understanding also.