The round went through Platt's upper arm, entered his chest, passed between his ribs, completely penetrated his right lung, cut a major artery in the arm and multiple blood vessels in the lung along the way and stopped about an inch short of his heart. It was a fatal wound but he lived long enough to kill some FBI agents. Overall penetration was decent, but due to the non-ideal angle and having to penetrate the arm before entering the chest, it didn't quite make it to the heart...."Miami FBI" shoot out of 1989. The 9mm STHP entered the bad guy's liver, destroyed it, penetrated 13 inches and expanded all the way.
Silvertips are just jacketed soft points with a metal covering. Al, I think.