I started using Barnes X bullets a few years ago...
Since then I have shot a moose, a couple of caribou, 3 or 4 hogs and perhaps half a dozen whitetails with them, plus 3 coyotes...
So far, in every case, the Barnes bullets expanded well and in most cases dropped the game right where they stood..
They also seem to create much less bloodshot meat than lead bullets, and are very accurate in my rifles..
SO I intend to keep using them until I have a reason not to...