You actually want a bullet that will transfer its energy all the way through the animal. Not expend its energy half way through.
Perhaps the quickest elk kill and the 2nd largest rack bull that I ever killed happened exactly like that.
I was doing a DIY, solo, backpack bighorn sheep hunt in one of Montana's unlimited sheep tag units in the AB Wilderness north of Yellowstone NP. It was my first time in that area, and I think it was my first sheep hunt. It was early September and I hadn't seen any sheep or even any sheep sign, but I had seen a few elk and they were beginning to bugle.
About the 3rd morning of my hunt I was walking from my camp to a ridge where I hoped to glass for sheep, when there was a loud bugle not far away. I crouched down and waited. The sound of the bugles got closer, and soon I could see the ivory tips and the almost black 6x6 antlers moving through the lodgepole pines. He stopped broadside to bugle about 75 yards from me.
I was hunting with my .257 Ackley loaded with 117 gr Sierra GameKing bullets. I then forgot all about sheep hunting, and put the crosshairs of my 6x Leupold in the crease just behing the bull's shoulder. When the shot went off, the bull simply collapsed straight down where he was standing and never moved again.
The bullet hit a rib going in, it shredded the lungs and heart, and didn't even cut the inside of the opposite rib cage. 100% of that bullet's energy was expended inside that bull's chest.
His antlers were very symmetrical and in just about perfect shape. He net scored 330 B&C inches. I finally got him mounted quite a few years later, but had to use a cape from another bull that I had shot. Of course I had him mounted bugling, and every day since I have enjoyed looking at him on my wall and remembering that hunt.