Help Is Survival Possible with a .338 Winchester Magnum Shot to the Head in This Scenario?

[L'absent]

A big game hunting expert told me he finds completely absurd some claims about the possibility of survival in the following scenario.

With a .338 Winchester Magnum and the barrel inserted into the mouth, aimed toward the back of the head and positioned deeply enough, the release of gunpowder gases directly into the oral cavity would cause an explosive increase in intracranial pressure. According to the hunter, this alone could cause the skull to rupture, regardless of the projectile's exact trajectory or even completely missing the brainstem. Even with a jolt or inexperience, death would be practically guaranteed.
However, he talks about immediate death, completely missing the shot towards the brainstem and therefore not hitting it at all

Is this a realistic assessment?

 

[donttalktome]

There is always a possibility of survival of survival no matter what method u use or what u do in life, in general. Life is random chance. But yea u have at most a 1% chance of failure or maybe 0.1% considering what you are trying to do.