I seriously doubt a GMX would explode like that. I dug a .30 cal 150 gr GMX bullet out of a gravel pit that still retained 144 grains that probably hit in the neighbourhood of 2500 fps and had a near perfect mushroom. I hit a black bear this spring with 2 x 168 TSX bullets from a 30-06. First one struck rib at entrance, hit more ribs and the off side shoulder bone while exiting. Bear still ran, short distance but tumbled into a small gulley. Second shot, to make sure, hit brisket, exited out back hip bone or complete lengthwise pass through. Bear done. No bullet recovered.