I have had minimal success with barnes 120gr & 100gr tsx for my 6.5 Grendel, groups from .5 to 1.5 with both weight bullets, flyers often.. I now have a M1A in 6.5 Creedmoor, starting off with factory Hndy 120gr gmx, which is light for the Creedmoor, then to handloads, Lapua brass and 130gr...