Shot the AR2209 loads at the range today, very happy with the results.
45 gr - 2495 fps
46 gr - 2580 fps
47 gr - 2640 fps
48 gr - 2700 fps
49 gr - 2760 fps

...a little faster than your loads, 93x64mm

The S&B case is close to 100% load density at 49 grains, but another half grain or so would probably fit and would push the velocity closer to the published 2800 fps 'factory' figure.

Scope mounts next!