Remember what I said about the ballistic geletain example and the funnel shape.

If you compare apples-to-apples, hitting in the exact same spot, at the same angle, even with the exact same slug weight and design, a complete pass thru will be delivering more energy than the slug stopping somewhere short of exiting. It's simple logic/physics.

Remember the funnel.

Think of it this way. (it's just an example, no offense intended)........

Let's say your chest is 10 inches thick. If I were to strike you in the chest with the butt end of a baseball bat with enough force thatthe butt end stopped 5 inches into your chest, and then did it again with enough force to drive the bat completely thru or even just 9 inches thru.

Which would deliver more energy?