I've tried them both in the 6.8 of mine in 130 grain. It really didn't like either one of them much. Tried all kinds of loads and powders. Best group I got with either was with the GMX being right at 1.5" 5 shot group at 100 yards. I tried that load out on a hog and it did perform well. Blew through a hog at 98 yards like it wasn't even there. Judging from the exit, it opened up fully leaving around a 3 inch diameter hole on exit. Never hit an animal with the TTSX but I've never been able to get them to shoot worth a damn from either the 6.8 or my .243. I may try to get them to shoot out of my WC .223 AR since I do like to take that one on sounder hunts.