And by the way, a bullet doesn't move so fast it doesn't expand....They are just like cars, the faster they are moving when they hit something, the more damage is done...
Now, if a fellow is using a .300, chances are he may also be using a tougher bullet as the .300 would be more suitable for elk than deer...These bullets will zip through without mushrooming much because they are "harder", causing less internal damage...
That would not be bullet failure but hunter failure to use the proper bullet for the game he is hunting...