The three shot group to the far left is comprised of three .40 S&W rounds from an Astra Model A100 at appx 50 feet.  The two shot group to the right of that (still on the left panel) is comprised of two .45 ACP rounds, fired from an Astra Model A100 .45 ACP with a five inch barrel.  It is not very obvious in the picture, but these five shots do not even bend or warp the steel.  They basically left little round stains on the stainless steel surface.

On the right panel, these two shots are from the armor piercing bullets at 100 yards.   They EASILY penetrated this one inch thick plate of solid stainless steel!!   These rounds are capable of penetrating two and even three inches of the same.