Ok, little report for the load dev for the Ai 20" barrel.
Loading off the lands 0.05 with some twice shot and annealed Lapua brass, 175 Berger OTMs and 44gr of varget seems to do the magic. Getting 2650fps at 77deg, and a Stand Dev of 14.5, the accuracy is very nice.
I tried a 42gr load, it...