We have discussed this, and it is too bad we haven't been able to find that information again. I suspect the selection of the .40 then had more to do with it being the common police cartridge than bear skill penetration.
Back to the Shockwave, impressive performance on the video, but a reason handguns, and I emphasize "hand," do well in bear attacks is due to their ability to be shot one hand. The Shockwave becomes a no-go for me for that reason, although the semi auto model would be more interesting. Really hard to beat a 1301 or M2 with a micro and Brenneke slugs backed up by a handgun.