Just in case you wanted to know At 10 yards Target : 1/4inch Steel diamond plate Angle of Incidence 5 degrees .22lr HV. 36gr. solid splatter, no dent 7.62x25 85 gr. HP splatter, depression . Diameter .475 depth .125 5.45x39 70 gr. ball projectile penetration 5.45x39 53 gr. ball projectile penetration 5.56x45 55 gr. ball projectile penetration. (didn't test m855 because std ball penetrated) 12Ga. Brenneke Special Forces Short Magnum 2 3/4 525 gr. Plate compromised. Spalling at rear of plate. Plate Split and deformed. Diameter of plate deformation 3.15" Maximum depth of plate elongation from as measured from the rear of the plate 1.0 inches. I should also mention that it removed the plate (18x12x.25) from the plate stand and tossed it 5 feet to the back of the pit. I was going to try steel slug on steel plate but chickened out. But looking at the Brenneke results I'm pretty sure it was going to go through. Monolit32 considering the mfg states it can penetrate 6mm steel at 20m. Future tests to follow with pictures. (once I can find the card reader for the camera) Future tests will include above plate: with 2 layers ceramic tile in over lapping matrix with 2 layers ceramic tile in fiberglass mat pack. with 1 layer ceramic tile and cement board. and anything else i can think of putting together.