Full-power .357 Mag 158-grain ammo factory specs are typically 1235 fps from a 4" barrel. 1250 fps wouldn't be a reduced load.
Federal has a habit of announcing a load, doing a small production run of it, and waiting a couple of years or more to do another run of it. I really want to try HydraShok Deep in .38 Special. They haven't produced it since before Covid.
It appears the .357 mag HST load is still vaporware at this point. I'll buy some and probably switch to it as soon as it's available, but I ain't holding my breath.
ETA: It doesn't show up on either Federal's LE or commercial websites or on Ammoseek.