[fzzt]

This appears to be a poorly-sourced "research" page put together by a marketing agency. There's really nothing there about the methodology of this work, and there's plenty to suggests the authors have very little knowledge of firearms (a fired bullet in the first animation is shown with a casing, there's no discussion of bullet aerodynamics which are going to be very different for most sharp-tipped rifle bullets and for handgun rounds, etc) or physics (e.g., no accounting for energy when evaluating the velocity at which a bullet can penetrate skull).