I was lucky enough to obtain a few boxes each of 155 and 165gr HST in 40 S&W. I really like the HST bullet. The weather has been too bad to get out the chronograph, but the website lists the 155 at 1160fps and and 463 fp of energy. The 165 is 30 fps slower, but has 5 more foot pounds of energy. I have not heard much on stopping effectiveness of either, but if you have an opinion as to which one to carry I would like to know. I do not like 180gr bullets in the 40 so please do not tell me to go out and find those.