I have been a cartridge collector for over 4 decades now, so I do have some knowledge. As stated these were mainly designed for highway patrolmen, to give them enough penetration to penetrate car doors. Seeings how many car doors aren't made of steel any longer, I guess the need does not exist any longer. I agree, don't just waste this unusual ammo shooting tin cans. One to two dollars each is going price, so you did well. I keep a couple rounds of this with me whenever me and my 357's go traveling. You never know when a car door may attack you. I pulled one of these bullets and sectioned it to see what it's construction was. It is simply a soft lead bullet, aka core, with the thin copper jacket surrounding the core. I was surprised that the jacket was so thin, even the nose section was thin.