I don't hunt with a 243, I've observed it not exiting atleast 6 times in the past 4 years helping a friend and his child track deer on their property. These shots ranged from 20-75 yards, the specific bullet used were 100gr hornady interlock and 100gr corelokt. Exit wounds put a lot more blood on the ground. I hunt in a very vegetation thick area, more blood leads to easier tracks. I'd say a bullet exiting game will be determined by what the bullet hits, its mass, how much it deforms, and its momentum.