Had the same exact thing happen yesterday evening. I shot an average size doe with a 165gr .30-06 through the rib cage, lungs turned to mush, totally destorying one shoulder on exit. It was not an easy shot due to the angle and distance (100 yds quartering away in thich brush) and based on how she took off, I was sure I had missed.......until I heard her pile up. No way an animal should be able to run 100 yds with those injuries, but she did. It happens. Next time you might hit one exactly the same way with the same load and it could die in place. Go figure.I think the others have pretty well hit it. BTW, you really can't judge bullet performance by looking at exit holes. Many times, if you examine carefully while field dressing, you'll see terrific damage of heart and lungs, and a caliber size exit hole. Don't get fooled by all the 'DRT' stories you hear. An awful lot of whitetails will go a short distance with totally destroyed lungs and heart, and maybe even shoulders, too- seen it happen.