Yes, the vest shot by AR15.com, (dumb idea, guys), was a II, possibly a IIA. A IIIA is better, and the newer they get, the better they get.
Yeah, I'll bet if I put a good thrust on the bayonet of my 91/30, it would penetrate- would I ever A) test such a theory, and then B) be STUPID enough to brag about it on the Internet, with PICS, so that all my law abiding Mosin owning friends could start worrying about Brady holding up printouts of these "tests" in support of an AWB/bayonet ban renewal, with the next Demo Pres and Congress? Nope.