I'm not a big fan of CorBon ammo, but they had a good idea with their .38 Special +P+ load launching a 158 grain LSWC-HP at a nominal 1000 fps from a 4-inch revolver. I don't think they catalog this load any more (or if they do, I haven't seen it in years), but I still have half a box or so.
Besides the CorBon, my favorite "FBI load" is the one offered by Remington. I have boxes of the FBI load from Federal, Winchester, and Remington, as well as the CorBon load, and intend to chrono them from snubby and duty length revolvers when I get the chance.
FWIW, a couple of years ago I chrono'ed the Winchester +P 158 grain LSWC-HP from a 2.5" S&W and got an average velocity of 820 fps, for 236 ft-lbs.