It works fine in 40, so 357 sig will work fine too. Just watch the chrono if you are going to push toward the top of the data, velocities will flatten out as charges increase and that is the point where you need to stop. At that point you are close to pressures spiking unpredictibly. Also be sure to prevent bullet setback, TiteGroup isn't very forgiving of setback.
If you don't mind a little muzzle flash and can trade the powder to someone with Power Pistol I think you will be ahead. Power Pistol is a much more forgiving powder and will push a bullet a good bit faster than TG with no drama.