The original Black Talon load was not all that effective by modern standards. It's bullet often clogged with fabric from passing through clothing and would not expand. For the most part, it was a hyped round.
Next came the SXT which was basically a redesigned Black Talon without the sharp "talon" edge petals and the black Lubalox coating. This is the load currently marketed to civilians by Winchester. From what I have seen of it, I am not too impressed.
The latest and greatest spin-off of the original design is the Winchester Ranger. Initial Ranger SXT bullets, as they were called at the time, also suffered a few problems with expanding after penetrating heavier clothing. But today's Ranger loads (the new versions have product numbers that start with RA, such as RA9T) have been refined to near perfection. They expand well in bare gel, gel covered with 4 layers of denim, from full size pistols, from compact pistols, etc. They have also had an excellent record in real life shootings as well. IMHO, they are the best handgun bullet on the market at this time for personal defense. The Speer Gold Dot and in some calibers, the Remington Golden Sabers are it's closest competition.
The Ranger bullets are not illegal for civilians to own and use, but since Winchester only markets them to LEO's, they are hard to find. But as Lumpy said, do some searching and you can find them.
-Charging Handle