AT-X 6.5 CM here. My barrel looks like the one diggler has. Shoots 1-3 moa using FGMM, Hornady 140 ELDM, a couple of Berger factory loads, and Lapua 136 scenar L. Chamber, grooves, lands look really bad near the chamber. FGMM 140 SMK keep it about 1moa.
Very disappointed to say the least.