Energy=massXvelocity. So your really fast lightweight bullets have a good bit of energy. Personally, I would rather have a good bloodtrail from 2 holes than 1 hole with an exploded bullet inside. With these fast-expanding bullets, what happens on sharp angle shots and facing shots??? If your bullet explodes on the first shoulder blade (which I've seen happen) you don't get into the ribcage. If you hit if far back hoping for an angle into the ribcage, then it explodes in the guts leaving no bloodtrail. What happens if you hit the deer high in the ribcage?? You would have a poor bloodtrail and a deer hightailing it away from you. In most cases, it may work well. But, I prefer a 30-06 or 270 with corelokt ammo that drives the bullet through the game. I've had exit holes the size of my fist. Deer roll right over like you hit them with a ton of bricks or they run 50 yards. But that's just me.