Actually, even the Corbon will get waxed in this competition IMO and experience.
Snubbies with 2" barrels chrono out 125gr Full House loads at 400 PFE..some are + that.
With the 9mm Corbon hitting its 1350 FPS it still needs barrel length...at least 4" for a good burn. Thats from a completely sealed barrel too.
If you shoot it from a Snubbie with a forcing cone/cylinder gap you loose valuable pressure and have 2" to push..just like the
357 does. I saw a 940 chrono +P 115's and crested 300 FPE..
Corbons may get a little more than that as they are one of THE 9mm rounds and so may some other guns as all chrono differently.
With the exponential rate of acceleration, your cutting alot of velocity of both calibers. For more power in a pocket gun, you have a 357 snub and a pocket 40 s/auto. Both are within a sneeze of each other for energy created.
Now, I will agree heart and soul that Id jump on the 9mm Scandium bandwagon...the 38+P just doesnt do it for me and as well as some are with a 357 snubbie, anyone would be better at follow up shots with the 9mm...especially from the fly weight gun.
Great Idea and IMO it deserves further consideration by a good gun maker...S&W or other wise.
Shoot well