i can think of plenty of gun shot critters that never die. too low of a shot just cuts belly and eventually heals over. Same with Brisket. I work part-time in a taxidermy shop, and have done several deer with small slugs lodged in jaws, noses and even one in an eye socket. all wounds were old, and scarred over. i shot the same fox twice. I rolled him with a shotgun early in the season, shot half his tail off, killed him about 2 months later in the same spot, only he took a 55 gr pill.