"Speer makes a 135 gr. JHP Short Barrel 38 Spcl. +P round especially for snubbies." What Cheapshooter said there is correct.
The trick to making power out of snubbies is to use fast powder. Pressure is good; but snubbies require that the pressure be developed quickly.
Most "defense" rounds are made with slower powders (especially .357 mags, but we're talking .38+p here). In the case of .38's, I suspect they are geared for 4" barrels or so. The Speer 135g GDHP SB (Gold Dot Hollow Point - Short Barrel) is the only ammo I know specifically designed for snubbies. They have fast powder that develop pressure quickly, and minimizes noise and muzzle flash, while pushing the slug as quickly as possible. They also have a large hollow cavity, designed to open up at lower velocities. Excellent ammo. I have them in my .357 for home protection. (My .357 is a 4" barrel, but I want less noise and flash for home protection.)
And for the record, I'm not employed or affiliated with Speer in any way lol.
Gun control laws benefit only criminals and politicians - but then, I repeat myself.