All these stories about odd happenings when a bullet seems to be placed correctly but the bullet has other ideas.... That's why I almost always keep shooting until they fall over!
Please forget about bragging of your "one shot" kills, and don't worry so much about holes in good meat or trophy capes. Odd things happen, and an extra hole or two is just good insurance. To prove my point, watch videos of guided hunts, especially in Africa. The guide almost always has to say "shoot again" because so may hunters are in the habit of admiring their shots, are not prepared to shoot again, and haven't trained to shoot again quickly and effectively on moving, wounded game.
I'll gladly take the elk on the ground with two or three holes in it vs the one in the bush with a hole in it somewhere....