Test fired a few rounds at 1941 yards today.
Used 96 grs of Viht N570 behind the 300SMK, and opened fire at at spot on a rock.
Cold bore was a 1/4 moa low and right, and the rest of the shots landed about 1 moa low of my aiming point. Vertical spread was very low, it seemed. Happy with the result, it was a hasty shooting since I was lying next to a road. Didn't want to piss of anyone out walking or riding a bike with the blast from my brake ;)
Will test at 2200 yards tomorrow, if weather is ok.