I have been unable to tell any difference in on-game performance between the GMX and TSX--or the Nosler E-Tip for that matter. They expand into 4 petals, and penetrate deeply. Have also gotten excellent accuracy out of all three--and in fact (as mentioned in one of my previous posts on this thread) I picked the 70 GMX for my pronghorn hunt partly because it shot more accurately than the 62 TTSX in my rifle.
