Pressure isn't just a function of its peak either. One way to view it is the Volume under the curve. A rapid rise to a sustained pressure could give more velocity than a spike to a higher pressure that was not sustained for the time the bullet was in the barrel.
I did see a friend hit a bear in the skull once with a 130 grain 270, and the bullet glanced off the skull. A second shot to the heart lung did the job right. But, I have never seen a rib do the same thing, even an elk rib.
Your results may vary.
