I am hoping HTC wont give it AP shells, that is what the 17 Pdr AT gun is for. Besides, the 17 Pdr has better AP performance any way.
Not that it matters now, but I vote to give it AA shot only. The 8.8cm Sprgr. Patr. L/4.5 Gerillt (High Explosive Fragmentation) could reach up to 32,000 ft.
I wonder how the trajectory compares to the 5in guns we currently have in AH? I'm guessing quite a bit flatter.