Congrats! FWIW, that's not an AR pistol. I'm not complaining. I'm just reminding everyone to make sure they know what they have before posting a pic of it on line.
As far as projectiles go, I would recommend AGAINST anything that uses a 110gr Vmax. I took a decent doe with that load out of a 10.5" upper in 2023 from a distance of about 12 yds. The damage was impressive, but the flight path took a drastic left turn after hitting a rib on the entry side. What should have been a heart shot based on her position, and the point of entry, ended up being a lung/liver shot. It put a 3" hole in the liver, and she only ran about 20 yds, but I'll never hunt with that bullet again.
I've never been able to get any of the other 110gr projectiles to shoot very well from either of my uppers. I'm currently using a 125gr MKZ for my 300 BO load. Accuracy is around 1 moa (not great, but acceptable). I tagged 2 during archery season this year so I didn't get a chance to "field test" it this year. I've been using their 105gr MKZ in my 6.5 Grendel for a few years now, and it has been extremely impressive in both accuracy (1/2 moa or better) and terminal performance out to 300 yds.