This is a guy from a user on another site that recently had a 260AI built by Alamo Precision. From what I've seen/heard from Robert, pretty much all of their guns will shoot .5moa, but some may be capable of .25moa. The owner of this gun got a 1.5" group at 400yrds while fire forming his loads.
Out of a 24" barrel this was his load and velocities
130g berger hunting, h4831sc powder, cci 200 primers, lapua brass
45.0 grains - 2674 fps 26 - Extreme sp
46.5 grains - 2769 fps 16 - Extreme sp
49.0 grains - 2886 fps 26 - extreme sp
49.5 grains - 2905 fps 54 - extreme sp and pressure signs
A few of the accuracy pics