120gr at 1000fps in a Sig 365/Shield size pistol with 13-14rd magazines. Standard duty G17 size pistol with slimmer, flush 21-22rd mags and very, very minimal recoil. Increased service life of parts and frame of course.
Possible 28rd 140mm mags for games and cool guys...
Same size difference between a 32 cal 120gr bullet and a 9mm 147gr as the 9mm 147gr has to 40 180gr - performance in tests likely similar enough.
Does it seem like a logical progression following the mass movement to 9mm or is 9mm the floor size wise?
I'd bite on the tiny ccw and game gun aspect.