I bought a box and chronographed it out of my 340PD 1.875" barrel last week. It averaged 816 FPS. Speer says that it expands fully at 860 FPS.
FWIW You can see results of a gel test on these rounds at similar velocities here, the photo at the bottom of the page, bottom row. A LOT of other rounds work fine in bare gel, if that is all you need.
<b>.38spl: Hornady FTX vs. Speer 135gr GDHP vs. CorBon 110gr DPX</b>