110 +P+ Treasury Load
For the front part of my career, the agency issue ammo was the above .38 spl load. As I recall it was alleged to run about 1200 fps from a 4" revolver. I used it on a number of ferals, deer injured in deer v. auto MVA's and from a Marlin 1894 on groundhogs. From a revolver, I was never much impressed with the results. The carbine obviously boosted it to another level.
About 1990 or so the agency had 2-3 shootings, and there was dissatisfaction with none involving clean "stops". There was a mad rush to the .357 mag w/ 125 JHP afterwards. We never had a shooting with mag ammo.
One old hand FI at FLETC told me that from lot to lot, supplier to supplier, the T- loads ability to actually make 1200 fps was not consistent. Another (Border Patrol I think) told me his outfit was satisfied with it in a number of shootings.
No matter, within 5 years, revolvers were largely removed from service and replaced initially with SIG P228 autos, and a 147 JHP standard pressure 9mm ammo.. I was really not impressed with that combo. I doubt it broke 1000 fps from the stubby P228 barrel. We never had a shootng with 9mm/147 either.
All that said, I would make the jump to 125's if I could manage them, for sure from a K or larger size revolver. From a snubby, I would go the other direction, abandoning hope of expansion from 2" tubes and going traditional with a 158 LSWC