Originally Posted By Ridgerunner9876:
On a serious note:
Provided that there is no penetration, and there is no protrusion of the vest into the body cavity (meaning that the plate does its job and spreads the impact over the surface area of the plate) the shootee will feel no more impact than the person shooting the rifle.
The plate, pushing into the shootee, being of much greater surface area, will impart LESS psi of pressure than the shooter feels from the butt plate.
It's a provable fact.
ETA: I should've read the origianl question again. I thought we were discussing a plate that would actually stop the round.
That would be the case if the gun in question did not have a brake or suppressor.