There is a signature line that I read on a different bulletin board that said "It is not the CALIBER of the rifle that matters, it is the CALIBER of the MAN behind it."
With a bullet designed for deep penetration and to break bone a .270 that expands out to twice the size you have a .54 wound channel. You need to have one of three things to happen. 1) hit the nervous system (brain or spine) to incapacitate the animal. 2) break bones that allow the animal to keep moving. If you are able to hit a foreword shoulder and the momentum of the animal causes it to tumble you will have a few more seconds while the animal tries to get up. 3) Cause a hydrostatic shock. This is where the force of the bullet sends a ripple through the body fluids and disrupts the nervous system. When you hear of an animal that get a solid hit and just stands there it could be that the bullet sent a shutter to the nervous system and muscles just lock up. When the shock wears off they just walk away. Some hunters think they missed.
Ideally you want all 3 to happen.
If you are going to be in grizzly country a cheap insurance policy would be loading a top quality bullet in your rifle. A Swift A frame, Trophy Bonded Bearclaw or the Failsafe are designed for this deep penetration. My personal preference is the Banes X because it acts like a solid after it expands.
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