Au contraire, in heavy clothing the expansion was 0.551 for the 9mm 135+P. At least in the catalog Hornaday sent me. 0.494 is correct for the standard pressure version. I didn't bother to check the .40.

Remember, the FBI themselves note that the purpose of their test protocol is to provide an apples to apples comparision of different ammunition in a standardized test. It is not predictive of real life results.

I'll also refer you to my comments about bullet placement. Magic bullets can't make up for sloppy shooting.