Handgun Silvertips and rifle Silvertips are different creatures entirely. Handgun Silvertips are hollowpoints, and have had jackets made of aluminum and varying alloys of nickle-plated copper, depending on the caliber. (Aluminum in slow numbers like .32 ACP and .45ACP, copper in hot stuff like .357 and 10mm.) I'm not sure that my friend's results would have been different with a different load, but it stands to reason. He shot the armed robber in the head, as the robber was swinging his gun around to shoot my friend's partner. It wasn't a "square-on" hit, and took out a piece of skull, but passed through enough of whatever passed for a brain that I think a 125gr. Remington SJHP would have expanded and killed the felon instantly. It certainly slowed the fellow down and kept him from firing accurately at the partner, but didn't drop him instantly. The felon survived, in a dramatically impaired condition. His suit was annoying, but unsuccessful. (Remember, no such thing as a one-shot stop!) I know that my young friend considered the ammo to have been less than optimal, and lobbied hard for a change, which ultimately came, though I cannot recall to what they switched. Likely, the ammo change came as part of a change from revolvers to autos.