They don’t.

And even if it does, the effect of a .375 bullet hitting is going to have more effect than a simple punch as it were.

At best we are looking at a heck of a case of whiplash.
Worst, think of all those traumatic brain injuries caused when the brain bangs around inside the skull causing unconsciousness, and severe bleeding internally.

FYI, a hard cast lead bullet .458″ and weighing 350-405gr isn’t stopped by 3/8″ steel plate when propelled at 1800fps.
The tree behind doesn’t fare that well either.