Went back and looked at my chrono data, just curious.
Had two snubbie .357s at the time, both 2" or thereabouts, one stainless (gone) and one titanium (still have it). Both painful to shoot with full loads! I don't remember if the stainless gun was ported, but the titanium one is, and I shudder to think how much worse it would be without the ports.... like catching a fastball in your bare hand, with every shot. Anyway -
Stainless .357 snub averaged 1,245 for 7 shots, Ti gun averaged 1,206 for 7 shots.
Also had a Smith 940 at one time (snubbie revolver chambered in 9mm) and with 1 7/8 barrel, averaged a surprising 1,228 for 5 shots, with 115gr. loads. All the loads I am referencing are Cor-Bon. The 940 "effective barrel length" was probably close to 3 inches, maybe 3 1/2, considering the length of the cylinder and probably losing a bit of velocity to the b/c gap.
My Hornady 4th edition (just the first thing I grabbed off the shelf shows max loads of 1,200fps (one load) and several others between 1,150 and 1,175 fps, with 124 gr. bullets, test gun listed as a Smith model 39 with a 4" barrel.
One thing's for certain..... a full-sized 9mm gun would be a LOT easier to hit anything with, than any of the snubbies I've ever owned or shot.
Full sized Blackhawk (6.5" barrel, effective length probably close to 8" counting the cylinder) exceeded 1200fps with 185gr. cast bullets.... and was vastly more accurate. That was a handload with a heapin' helpin' of 296. Probably could have gone higher, but it was superbly accurate at 50 yards, so I stopped load development. Certain I could shoot tighter groups at 25 yards, and probably 50, with that gun, than I could at 7 yards with any snubbie.