SXT WAS the Deep Penetrating Supreme Expanding Talon but not anymore. The "improvement" was getting rid of the talons. Now you can buy the new SXT (Black Talon substitutes) that aren't black and don't have talons. Why bother? I had a case of the real ones and sold them this year for close to 100% profit, which was still a lot less than anyone else was selling them for. If you can still find any they will probably be at least $40 for 20 rounds. BTW the black part of the Black Talons was the Lubalox coating that works the same way as moly coating. It had less friction and gave the bullets higher velocity and therefore more power, and lower pressure too. It was awesome, but they pulled it off the civilian market after a shooting spree on a New York subway in December 1993 mentioned by ericire12. Winchester/Olin ammunition got sued, Ruger got sued for making the pistol, and Ram-Line got sued for making the magazines for it too.