My niece took a cow moose (nuisance tag) several years ago with the 120 TSX from a 6.5x55. Not a 'hot' load
Moose was quartering to her( my brother and I finally got it right) at 80-100 yards. Bullet punched through shoulder bone, took out top of heart, broke a rib . Did not find bullet -did not look to hard as that was least of our concerns at the time��
Perfect performance, shoots well . My vote, which doesn't mean GMX would not do as well