I would expect that even a 17hmr would go through it. The IIIA designation is only for "blunt" tipped rifle bullets supposedly. Might try a 30-30 on it and see what happens. Better yet, I would like to see how it does if you put a piece of tin roof flashing on the front of it to dull the nose of the rifle bullets. Seen tons of "how to" videos claiming that the flashing and a piece of ceramic tile will stop an impressive range of calibers but I can't seem to find the time to do it myself.